西南大学博士入学考试英语试题(2012) +crAkb}i
Part I Vocabulary (10 points) ynOp7ZN$
Directions: In this part there are 20 incomplete sentences. For each sentence there 1xguG7
are four choices marked A, B, C and D. Choose the one that best completes the 3]N}k|lb%
following sentences. Then blacken the corresponding letter on the Answer Sheet +ypG<VBx%
1. A broadcasting station will sometimes to its listeners a programme which ^<E+7
it has received from another station. yFpHRfF}
. #
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A. rely B. relay C. relate D. reside fykN\b
2. The United Nations Conference on Drug Abuse, which took place earlier this year 22BJOh
in Vienna, was a very meeting. raqLXO!j
A. productive B. overwhelming C. compulsory D. protective E<\\ 'VF
3. A person who studies ___ learns how to express numbers approximately and zl:
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how to calculate ratios and averages. LpmspIPvf
A. static B. statistic C. statistics D. status 0H>Fyl2_
4. If you ______ someone, you form a fixed general idea or image of them so that ~JZLfw
you assume that they will behave in a particular way. [CUJ A
A. assimilate B. simulate C. stereotype D. subordinate &\"fH+S
5. Reading ______ the mind only with materials of knowledge, it is thinking that &)X<yd0
makes what we read ours. !8L
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A. rectifies B. prolongs C. furnishes D. minimizes x.^vWka(
6. Satellite communications are so up-to-date that even when _____ in the middle F}AbA pTv
of the Pacific, businessman can contact their offices as if they were next door. ~qqtFjlG^
A. gliding B. cruising C. piloting D. patrolling pbzbh&Y
7. Now a paper in Science argues that organic chemicals in the rock come mostly ReE3742@
from _______ on earth rather than bacteria on Mars. O,>&w5
A. configuration B. constitution C. condemnation D. contamination IL\mFjZ'
8. Scientists, who are now aware of how nautiluses regulate their buoyancy, have ?+|tPjg$
been able to dispel ideas about these creatures. 0ay!tS
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A. erroneous B. misdemeanors C. misgivings D. misdirection
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9. History has demonstrated that countries with different social systems and )F$Stg3e
ideologies can join hands in meeting the common challenges to human _____ and p!a%*LfND
development. +>3c+h,%.
A. evolution B. survival C. rivalry D. dignity ?hmb"^vlG
10. To avoid an oil shortage, we should advocate that more machines must _____ of 8;'n.SC{
life in a short time, and this made others astonished. M[{Cy[ta
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A. accelerate B. operate C. generate D. utilize -J30g\
11. Japanese leaders aboard the U. S. battleship Missouri and signed the ____ :$tW9*\KY
surrender, which ended World War Two in 1945. g.]'0)DMW
A. conditional B. infinite C. everlasting D. unconditional Sy'>JHx
12. It is a _____ that in such a rich country there should be so many poor people who 8$vH&HdI
could hardly keep their body and soul together. H<xC%/8
A. hypothesis B. paradox C. conflict D. dispute u l%bo%&~
13. The _____ effects of many illnesses made him a weak man and he still didn’t :kVV.a#g
want to do sports every day. LF~#4)B
A. cumulative B. formidable C. eternal D. prospective 5oKc=iX_3
14. The robbers broke into the bank, _____ the clerics with revolvers and forced them to give money just as they were about to knock off. YXtGuO\q
A. shot B. frightened C. amused D. menaced kYs|")isj
15. This pair of boots cost much less than yours for I bought them when the 16>uD;G
department store made a _____ of the stored goods. u J`&hX
A. clearance B. reduction C. fortune D. deal K;qZc\q
16. Technology has _____ the sharing information and the storage and delivery of [:QMnJ
information, thus making more information available to more people. o.5j@dr
A. formulated B. facilitated C. furnished D. functioned /wTf&_"mTL
17. Language, culture and personality may be considered _____ of each other I thought, p.9v<I%0
but they are inseparable in fact. 4BT`|(7
A. indistinctly B. separately C. irrelevantly D. independently /pU6trIM
18. More than 85 percent of French Canada’s population speaks French as a mother \uk #pL
tongue and _____ to the Roman Catholic faith. IR
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A. caters B. adheres C. ascribes D. subscribes NXBOo
19. There are not many teachers who are strong _____ of traditional methods in 2eU[*x
English teaching. m-8 9nOls
A. sponsors B. contributors C. advocates D. performers B`scuLl3
20. The ______ of the scientific attitude is that the human mind can succeed in (UF!Zb]{
understanding the universe. zy[=OX+
A. essence B. content C. texture D. threshold (U_Q7hja?
Part II Reading Comprehension (30 points) #mhD; .Wg
Directions: QYgN39gp
Questions 21 to 25 are based on the following passage. 9|?Lz
There are 6 reading passages in this part. Each passage is followed by />Vx*^u8Hz
some questions or unfinished statements. For each of them there are four choices nb_^3K]r
marked A, B, C and D. you should decide on the best choice and mark your answer on {z /^X<T
the Answer Sheet. ig}e@]
Spread across the United States are about 500,000 doctors, cheeked by jowl, in the 5%+}rSn7
big cities and thin on the ground in isolated small towns. In June 1986, the secretary oqba:y;AR
of health and human services, Dr. Otis Bowen, passed on a view of his experts: 5%-15% r.b6E% D
of America’s 500,000 doctors should be candidates for disciplinary action, many of +n[wkgFd
them because of drug taking or alcoholism. Others give their patients poor care U%DF!~n
because they are senile, incompetent, guilty of misconduct or out of touch with dB+GTq=6f
developments in medicine. cIvYfgIo9
The granting, or withdrawal, of licenses to practice is in the hands of state medical 4)HWPX
boards, but they are overwhelmed with complaints and lack the money to handle even _P<lG[V
a fraction of them. Recently, however, things have been changing. In 1985, 406 (oitCIV
doctors lost their licenses (compared with 255 in 1984), nearly 500 were placed on %lJiM`a
probation and nearly 1,000 received reprimands or had their right to practice curtailed. :{s%=\k {d
The federal inspector general demanded, and won the right far the states and the X$ B]P7G7
federal government, which provide health care for the elderly and for the poor under \678Nx
the Medicare and Medicaid programme, to refuse payment to the doctors considered R96o8#7Uv
unsatisfactory. 7ml0
Yet putting these powers into practice is proving to be far from easy. Of the 35 DIqT>HHZ
doctors so far denied reimbursement from Medicare, almost all work in lightly ; G59}d
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populated rural areas. On March 27th, their indignation and that of their patients were Flujwh@rg
a sympathetic hearing by the Senate Finance Committee. Rural doctors may not be as bEQtVe@`
up to date as those in the big towns, but they are often the only source of medical help `Kc %S^C'
for miles around and their patients are loyal to them. Members of the review boards, FPMSaN P
which are paid by the government, insist, however, that elderly and poor people "56?/ jF
should not be forced to receive (and the state to pay for) inferior care. An innovation is on the horizon in Texas, the most under-doctored state in the ]X:
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country (with only one doctor for every 1,100 residents). Lubbock University is #1't"R+3M
setting up a computer network that will enable country doctors to obtain medical 6l\UNG7
expertise and access to medical records in a hurry. The aim is to reduce the isolation rZ.a>'T4
of the country doctors and thus, in the long run, to attract more young doctors to rural &&9c&xgzE
areas. ,-7/]h,l
21. The main topic of the passage is . L_gsG|xX
A. the present situation of American doctors /y](mu "!
B. the legislation on rural medical services R)d99j^"
C. the problems of country doctors and possible solutions f1Yv hvWL
D. some factors of disqualification of country doctors }&(E#*>x
22. According to the text, disciplinary action should be taken against those who :%uyy5A
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give patients poor care because of the following reasons EXCEPT . |.8d,!5w}
A. taking drugs and drinking alcohol iVq#aXN
B. feeling remorse of their bad behavior -[f"r`
C. being professional unskillful Z9"{f)T
D. being sick and conservative 8)W?la8'p
23. Which of the following is true about the unfit doctors? 8L7Y
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A. 1,500 doctors were deprived of the right to practice medicine. AJ>BF.>
B. The federal government has got the right to deny reimbursement to those )'j_D<
unqualified doctors. =wIdC3Ph
C. Almost all the doctors who fail to get payment from Medicare work in 'z +$3\5L
densely populated urban areas. B_."?*|w
D. Patients in the rural areas complain about the poor treatment their doctors uG=t?C6
give them. _OJ0 < {E
24. It can be inferred from the text that in the near future . >J^7}J
A. there will be more qualified doctors in rural areas -YzQ2#K
B. there will be an even more serious imbalance of the number of rural and vLv|SqD
urban doctors YW?7*go'Z
C. country doctors are competitive in breaking medical records BaWQ<T8p8
D. more patients will go to rural areas for medical treatment KFTf~!|
25. The paragraph following the text would probably discuss . %w'/n>]j
A. problems of urban doctors ~t{D5#LVHa
B. other solutions to improve the present situation lL:KaQ 0E
C. research in medical science Qb!!J4|!
D. reduction of staff in rural hospitals .)iO Du
Questions 26 to 30 are based on the following passage. aW0u8Dz
Bacteria are extremely small living things. While we measure our own sizes in ?(5o@Xq
inches or centimeters, bacterial size is measured in microns. One micron is a 4ss&'h
thousandth of a millimeter: a pinhead is about a millimeter across. Rod-shaped DC?21[60
bacteria are usually from two to four microns long, while rounded ones are generally cm@jt\D
one micron in diameter. Thus, if you enlarged a rounded bacterium a thousand times, c=b+g+*xd
it would be just about the size of a pinhead. An adult human magnified by the same 5z1\#" B[
amount would be over a mile (1.6 kilometers) tall. 4t&gW
Even with an ordinal microscopy, you must look closely to see bacteria. Using a Q=d.y&4%
magnification of 100 times, one finds that bacteria are barely visible as tiny rods or zb"rMzCH
dots. One cannot make out anything of their structure. Using special stains, one can ~A^E
see that some bacteria have attached to them wavy-looking “hairs” called flagella. >%9^%p^
Others have only one flagellum. The flagella rotate, pushing the bacteria through the TRF]i/Bs
water. Many bacteria lack flagella and cannot move about by their own power, while others can glide along over surfaces by some little-understood mechanism. pTcbq
From the bacterial point of view, the world is a very different place from what it is 6yE'/VB<
to humans. To a bacterium, water is as thick as molasses is to us. Bacteria are so small O4m(Er@a
that they are influenced by the movements of the chemical molecules around them. 4cott^K.
Bacteria under the microscope, even those with no flagella, often bounce about in Kb^>X{
the water. This is because they collide with the water molecules and are pushed this D,c!#(v cK
way and that. Molecules move so rapidly that within a tenth of a second the molecules 9GO}&7
around a bacterium have all been replaced by new ones; even bacteria without flagella {bT9VZ>
are thus constantly exposed to a changing environment. inYM+o!U
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26. Which of the following is the main topic of the passage? F4GP7]
A. The characteristics of bacteria EbCIIMbe"
B. How bacteria reproduce wz|DT3"Xs
C. The various functions of bacteria ypH8QfxLTr
D. How bacteria contribute to disease 5gSylts8
27. Bacteria are measured in __________. 5QAdcEcN@O
A. Inches XcOA)'Py
B. Centimeters S"zk!2@C
C. Microns d]8_l1O
D. millimeters fO6[!M(
28. Which of the following is the smallest? u+m4!`
A. A pinhead Z(p*Z,?u
B. A rounded bacterium jO=*:
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C. A microscope :V-k'hm
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D. A rod-shaped bacterium 80|onP\L
29. According to the passage, someone who examines bacteria using only a 6JSY56v
microscope that magnifies 100 times would see ___________. t)} \9^Uo
A. tiny dots IK'F{QPH
B. small “hairs” dByjcTPA
C. large rods wFvT0
D. detailed structures 1SUzzlRx
30. The relationship between a bacterium and its flagella is most nearly analogous to 1f
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which of the following? }%$OU = T
A. A rider jumping on a horse’s back 09d9S`cS\
B. A ball being hit by a bat B!}BM}r
C. A boat powered by a motor oSY7IIf%L
D. A door closed by a gust of wind. +"8}R~`!
Questions 31 to 35 are based on the following passage. TGf;_)El
Although, recent years have seen substantial reductions in noxious pollutants from "]#'QuR
individual motor vehicles, the number of such vehicles has been steadily increasing. cvfUyp;P
Consequently, more than 100 cities in the United States still have levels of carbon >
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monoxide, particulate matter, and ozone (generated by photochemical, reactions with fagM7)x
hydrocarbons from vehicle exhaust) that exceed legally established limits. There is a & fu z2xv
growing, realization that the only effective way to achieve, further reductions in ;1`!wG-DD
vehicle emissions-short of a massive shift away from the private automobile-is to I8u!\F
replace conventional diesel fuel and gasoline with cleaner burning fuels such as XQ?fJWLU
compressed natural gas liquefied petroleum gas, ethanol, or methanol. 'Jydu
All of these alternatives are carbon-based fuels whose molecules are smaller and <bUXC@3W
simpler than those of gasoline. These molecules burn more cleanly than gasoline, in Uw)=
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part because they have fewer, if and, carbon-carbon bonds, and the hydrocarbons they CZ(`|;BC*
do emit are less likely to generate ozone. The combustion of large molecules, which have multiple carbon-carbon bonds, involves a more complex series of reactions. G;s"h%Xw98
These reactions increase the probability of incomplete combustion and are more likely % (<(Y
to release uncombusted and photochemically active hydrocarbon compounds into the &RO7{,`
atmosphere. On the other hand, alternative fuels do have drawbacks. Compressed Y:psZ
natural gas would require that vehicles have a set of heavy fuel tanks-a serious %dW%o{
liability in terms of performance and fuel efficiency and liquefied petroleum gas faces ag8`O&+
fundamental limits on supply. =6\LIbO
Ethanol and methanol, on the other hand, have important advantages over other S^N{wZo
carbon-based alternative fuels; they have hither energy content per volume and would hw=GR_,
require minimal changes in the existing network for distributing motor fuel. Ethanol is %e?fH.)
commonly used as a gasoline supplement, but it is currently about twice as expensive {C")#m-0
as methanol, the low cost of which is one of its attractive features. Methanol’s most U~H?4Izl=
attractive feature , however, is that it can reduce by about 90 percent the vehicle ;:]\KJm}?
emissions that form ozone, the most serious urban air pollutant. EzpFOqJG
Like any alternative fuel, methanol has its critics. Yet much of the criticism is -RMi8{
based on the use of “gasoline clone” vehicles that do not incorporate even the simplest ss
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design improvements that are made possible with the use of methanol. It is true, for 0L#/lDNk
example, that a given volume of methanol provides only about one-half of the energy pe.QiMW{8
that gasoline and diesel fuel do; other things being equal, the fuel tank would have to obo&1Uv,/
be somewhat larger and heavier. However, since methanol-fueled vehicles could be +Xy*?5E;C
designed to be much more efficient than “gasoline clone ” vehicles fueled with ke%pZ7{u
methanol, they would need comparatively less fuel. Vehicles incorporating only the Y;
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simplest of the Engine improvements that methanol makes feasible would still )T|L,Lp
contribute to an immediate lessening of urban air pollution. lAi2,bz"
31. The author of the passage is primarily concerned with __________. nxo+?:**
A. countering a flawed argument that dismisses a possible solution to a problem. BRv x[u
B. reconciling contradictory points of view about the nature of a problem. 1^G{tlA-
C. identifying the strengths of possible solutions to a problem. :iUF7P1I
D. discussing a problem and arguing in favor of one solution to it. 6b=q-0yj
32. According to the passage, incomplete combustion is more likely to occur with szmmu*F,U:
gasoline than with an alternative fuel because: __________. ,wAz^cK|
A. the combustion of gasoline releases photochemically active hydrocarbons. IV `%V+
f
B. the combustion of gasoline involves an intricate series of reactions. &
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C. gasoline molecules have a simple molecular structure. R 94^4I
D. gasoline is composed of small molecules. 'T8W!&$
33. The passage suggests which of the Following about air pollution? z=Cr7-
A. Further attempts to reduce emissions from gasoline-fueled vehicles will not 6iA( o*'Yn
help lower urban air-pollution levels. )>a B
B. Attempts to reduce the pollutions that an individual gasoline-fueled vehicle j\&pej
emits have been largely unsuccessful. [wnDHy6W
C. Few serious attempts have been made to reduce the amount of pollutants 4JyM7ePND}
emitted by gasoline-fueled vehicles. 23]Y<->Eu<
D. Pollutants emitted by gasoline-fueled vehicles are not the most critical source [
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of urban air pollution. *%5{'
34. The author describes which of the following as the most appealing feature of ti @kKz
methanol? Zyf P;&
A. It is substantially less expensive than ethanol. E%N2k|%8d_
B. It could be provided to consumers through the existing motor fuel distribution |a^U]
system. LW)H"6v
C. It has a higher energy content than other alternative fuels. D. Its use would substantially reduce ozone levels. zg)sd1@
35. It can be inferred that the author of the passage most likely regards the criticism &HZmQ>!R D
of methanol in the last paragraph as __________. zbkMFD.{y
A. flawed because of the assumptions on which it is based. %kshQ%P)?
B. inapplicable because of an inconsistency in the critics’ arguments. #'baPqdO
C. misguided because of its exclusively technological focus. c]k*}W3T
D. invalid because it reflects the personal bias of the critics. $.%rAa_H
Questions 36 to 40 are based on the following passage. 8 .>/6M
Tests of reaction times seemed to back up the notion that the two hemispheres m"eteA,"k_
differed in their processing styles. Researchers used to believe that an image goes to tz NlJ~E
one hemisphere first, and then to the opposite side of the brain. If the nature of the zmuMWT;
stimulus and the preference of the hemisphere match up, then the person can respond o+B:#@9?
slightly more quickly and accurately in identifying the local or global image. 2S[-$9
Still more startling, researchers found that the same appeared to hold for the brains xgu `Q`~
of chimps and perhaps other primates. The assumption has always been that ZD/jX_!t
handedness and brain asymmetry are strictly human traits --- part of the great brain bBcp9C)iY
reorganization that allowed our ancestor to use tools, speak and perhaps even think )j l8!O7
rationally. But handedness is now widely claimed for primates and even birds, w'4AJ Q|;
amphibians and whales. And in the past few years, some psychologists have tested W*DVi_\$y
chimps and baboons and suggested their two hemispheres also differ in processing PXoz*
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style. p
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Now researchers have come to see the distinction between the two hemispheres as D1
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a subtle one of processing style, with every mental faculty shared across the brain, and eYUr-rN+)z
each side contributing in a complementary, not exclusive, fashion. A smart brain \2-@' ^i
became one that simultaneously grasped both the foreground and the background of BAj-akc f
the moment POI.]1i
The next problem was to work out exactly how the brain manages to produce g1E~+
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these two contrasting styles. Many researchers originally looked for the explanation in %sBAl.!BN
a simple wiring difference within the brain. This theory held that neurons in the left ~[o4a '
cortex might make sparse, short-range connections with their neighbors, while cells n%^ LPD
on the other side would be more richly and widely connected The result would be that 9h90huyKF
the representation of sensations and memories would be confined lo smallish, discrete J&/lx${
areas in the left hemisphere, while exactly the same input to a corresponding area of _m
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the right side would form a sprawling even impressionistic pattern of activity. MTER(L
Supporters of this idea argued that these structural differences would explain why )5j;KI%t
left brain language areas are so good at precise representation of words and word =h6
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sequences while the right brain seems to supply a wider sense of context and meaning. 0 S_ ':r
A striking finding from some people who suffer right-brain stokes is that they can {gA\ph%s
understand the literal meaning of sentences-their l eft brain can still decode the `i) 2
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words-- -but they can no longer get jokes or allusions. Asked to explain even a `!:q;i]}
common proverb, such as “a stitch in time saves nine”, they can only say it must have Yb i%od&
something to do with sewing. An intact right brain is needed to make the more playful 5
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connections. 87%*+n:?*
36. The local or global image is more quickly and accurately identified in the brain ,t{,_uPJY
if _______. 4h!f/aF'
A. tests of reaction times back up the notion of the two hemispheres <e]Oa$
B. an image goes to one hemisphere first, and then to the opposite side of the u<q :$
brain e~ aqaY~}
C. the nature of the stimulus and the preference of the hemisphere match up
93+"D`
D. the person can match the image with an object 37. Handedness and brain asymmetry are strictly human traits, as is shown in ;4M><OS!
________. tkQH\5
A. the brains of chimps and perhaps other primates O1 .w,U
B. the fact that the great brain reorganization allowed our ancestor to use tools hmx=
35
C. the fact that human beings alone can use tools, speak and think rationally \T]EZ'+O
D. the two brain hemispheres of chimps and baboons IKMeJ(:
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38. According to the text, a smart brain has all the following characteristics .6O"|
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EXCEPT _________. Q$obOEr2(
A. with different processing style ihh4pD27g
B. with shared mental faculty MS(JR
C. each side contributing in a complementary FJ*i\Q/D
D. grasping the foreground and the background of the moment i,V;xB2
39. What is the problem of the people who suffer right-brain strokes? mS#zraJn5
A. They can hardly understand the literal meaning of sentences. E^GHVt/.
B. Their left brain can still decode the words. 87}&`
C. They do not understand the common proverb “a stitch in time saves nine”. 4`Q3v4fOF
D. They cannot grasp the meaning of jokes or allusions. 5Zmw} M
40. The best title for the text may be __________. j-CnT)W<
A. Left Brain, Right Brain %}86D[PF
B. The Local of Global Image ]
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C. Human Brain and Animal Brain d=,%=@
D. The Smart Brain D+~_TA
Questions 41 to 45 are based on the following passage. k>dsw :
(此文不全) @i^~0A#q*
The Du Pont Company, the 13th largest employer in the U.S., routinely gives ?u4INZ0W
pre-employment blood tests to all blacks who apply for jobs to determine who might b
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be a carrier of the trait for sickle-cell anemia, even though the trait is regarded as U yw-2]!n
largely harmless. Although there are other genetically transmitted blood diseases and mh<=[J,%p
metabolic disorders that predominate in racial or ethnic groups, blacks are the only Ca%g_B0t
ones to be identified with a disease and examined for it at Du Pont. In a three month =9kN
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study of genetic screening in the American lace, the New York Times found no ?ER-25S
other instance of an ethnic or racial group singled out in or company. ,!V]
jP)
Du Pont officials emphasize that the sickle trait tests do not represent discrimination J$~<V
IX
and are only an effort to help them avoid potentially harmful exposure to certain BmHwu{n'
chemicals. Yet the officials can offer no firm evidence that the trait -- not the disease, "Jjs"7
but only a single abnormal gene -- makes blacks more vulnerable. qQ!1t>j+H
Du Pont, which employs well over 100,000 workers, is in the vanguard of American i
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companies doing genetic screening and thus is at the center of the debate over this 64-#}3zL
area of science, debate so intense, so broad, that even medical directors from other kNu'AT#3|
companies who believe possibilities of genetic screening want no part of it. At m/N dJMoN=
least, not now but officials at Du a leader in the chemical industry with annual E;21?`x5
gross sales of more than $ 10 billion, feel they have the money and the scientists to >NB?&|
turn the distrust into achievement. If some chemicals are highly toxic and the 'qdPw%d
workplace is less than pure, company officials reason, it is only logical to try to _(m't n>
determine why some workers get sicker faster and why others seem to have more c9R5w.t:
tolerance for industrial poisons. And so the company is looking beyond the skills and g*w<*
loyalty of its workers to ery genetic structure. |[9?ma
The sickle-cell trait is not the same as sickle-cell anemia. The anemia is rare but 6<0n *&
debilitating disorder found in fewer than 50,000 American blacks, about two-tenths of [i0Hm)Bd3
a percent of the black population. Perhaps two million other blacks are carriers of the trait -- they are heterozygous; that ing a gene for sickle-cell fQLt=Lrp
anemia from one parent. Virtually all the carriers can lead very active lives and show nUq<TJ
no symptoms of the disease. <8UYhGK
41. What does the author say about Du Pont? LQnkcV
A. It examined the blood of some blacks VL'
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B. It examined some blacks for their knowledge of blood.
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C. It discovered that some blacks have blood illness. iR$<$P5
D. It discovered the blood of some blacks containing industrial chemicals. &rDM<pO #-
42. What do Du Pont officials say? }HEvr)v9
A. They are trying to protect blacks form health threats. `V[!@b:
B. They can prove that blacks are likely to have health problems. 5>J=YLq
C. They regard the skills of workers as the most important matter. 4/X/>
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D. They hope that other companies can follow their example. /ug8]Lo0
43. What is true about genetic screening?
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A. It often aims at black employees.
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B. Its focus is often on sickle-cell anemia. >r &;3:"
C. Some companies do not want to do it. BQ^H? jo
D. The US government strongly supports it. b]E|*
44. The underlined word “toxic” in the third paragraph probably means _____. )m3q2W
A. powerful. *`(
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B. complex. reo{*)%
C. thick. c62=* ] ,
D. poisonous. _w@qr\4i=
45. What can we learn about the carriers of sick-cell trait? jQU"Ved
A. Their number is about 50,000. yV)m
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B. They usually seem to have normal lives. _wb0'xoK"
C. They include over half of the black population. Ba\6?K
D. They do not seem to be affected by industrial chemicals. >-E<