Only minutes after the probes hit the ground, the lander will follow, descending by parachute and braking engine. Bristling with cameras and sensors, it will study Mars' terrain and weather, snapping pictures both during its descent and on the surface. It will also carry a microphone to record for the first time the sound of the Martain wind. More important, the ship will be equipped with a robotic arm and scoop , much like the arms carried aboard the Viking landers in the 1970s. Unlike the Vikings, though, which were able to paw just a few feeble cm into the Martian topsoil, the new ship will dig out a trench nearly 90 cm deep. |=EZ1<KzD
How long all this otherworldly hardware will operate is uncertain. The probes, powered by batteries, should wink out within three days. The lander, with robust solar panels to keep it humming, could last three months. But even if the systems do not survive that long, their work could be profound. After all, scientists have spent years studying just the Martian skin; this will be their first chance to dig a little deeper. BbRBT@
bcAvM;
71. We learn from the first paragraph that, in order to have a thorough knowledge of Mars, we TuW/N
L|
need ___. 5l,ZoB8
A. to treat Mars with more respect than ever 9{$'S4
B. to have more spacecraft orbit the Red Planet Raw)9tUt
C. to protect the Red Planet more carefully and not to wound it Z(ZiFPx2Z
D. to penetrate the crust of the Red Planet to take Martian samples %J8|zKT5t
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72. Which of the following is true according to the passage? /5#rADOS
A. The spacecraft that is to arrive in September 1999 contains a pair of tapered pods. )NO<s0?&
B. Mars Polar Lander will carry out more important missions than Mars Climate Orbiter. u-1;'a
C. The difference between Viking landers and Mars Polar Lander is that the former was unable i
[ $0a4
to land on Mars. fi+R2p~vs
D. The mission of Mars Climate Orbiter is to study the local atmosphere and Mars terrain, 1lsLJ4P
snapping pictures both during its descent and on the surface. `juLQH
KE1ao9H8wR
73. The primary purpose of the passage is to ___. .^bft P\
A. stress the importance of exploring Mars
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B. outline the general features of Mars 0oh]61gC
C. describe in detail the way of landing of Mars Polar Lander ,KJw|x4}\
D. introduce the mission of the two spacecraft which are due to launch in 1999. q\rC5gk>
8_&CT
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74. We learn from the passage that ___. h b/]8mR
A. Mars Climate Orbiter will serve as a space base for any later ship that may land on the YUf1N?z
surface of Mars ^ZM0c>ev=l
B. Mars' south pole is more likely to contain life because it contains water 'u4ezwF;
C. Mars Polar Lander will strike the surface of Mars at 650 km/h \]9.zlB
D. the chemical makeup of the soil on the surface of Mars will be similar to that of the earth ]hud4i~
cE iu)2*e
75. From the context, we can infer the meaning of "bristling" (line 2, para. 4 ) may be ___. \ j.x0/;
A. abundant in B. sending out 1 ^g
t1o
C. reacting D. taking up =&dW(uyzY
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Passage Four L&-hXGx=7
An outsider approaches the subject lively, lest civic(市民的;城市的) feelings be bruised. Los Angeles gives the impression of having erased much of its history by allowing the city's development to run unchecked. Insiders like Dolores Hayden...pull no punches: "It is...common," she wrote, "for fond residents to quote Gertrude Stein's sentence about Oakland when summing up urban design in Los Angeles: "There's no there, there.'" Hayden has also acknowledged that Los Angles is generally "the first (American city) singled out as having a problem about sense of place." Both statements come from a handsome brochure-cum-itinerary, drawn up by Hayden, Gail Dubrow, and Carolyn Flynn to introduce The Power of Place, a local nonprofit group with a mission to retrieve some of the city's misplaced" there." 8SmnMt
Founded by Hayden in 1982, The Power of Place lays special emphasis on redressing an imbalance in memory---and memorials. As Hayden has pointed out, in 1987 less than half the population of Los Angeles was Anglo-American; yet almost 98 percent of the city's cultural historic landmarks were devoted to the history and accomplishments of Anglo-Americans. Even these personages(名人,要人) come from a narrow spectrum of achievers---in Hayden's phrase, "a small minority of landholders, bankers, business leaders, and their architects" ----almost all of whom were male... z^nvMTC
The likeliest explanation for this under-representation may be an urban variation on the great-man theory of history: History is what public figures do, and by their civic monuments shall you know them ---especially the structures they designed or built. In Hayden's view, however, "The task of choosing a past for Los Angeles is a political as well as historic and cultural one, " and the unexamined preference for architecture as the focus of historic preservation efforts can slight less conscious but perhaps equally powerful human forces. Hayden's goal has been to supplement the city's ample supply of mono-cultural landmarks and memorials with others representing its ethnic and gender-based diversity. Accordingly, some sites need new status as official land-marks, others need reinterpretation. Other sites no longer contain structures emblematic(作为标志的) of their histories or are located in blighted neighborhoods; these do not readily lend themselves to resuscitation (复兴)through renovation and commercial development , as preservationists have managed elsewhere. dV?5Q_}
The Power of Place has identified nine places on which to concentrate in the first phase of its work: development of a walking tour of little-known Los Angeles sites, for which The Power of Place brochure serves as a guide. XI Jlc~2
The Power of Place brochure concludes its summary of what is known about each stop on the walking tour with a postscript(附言)called Placemaking, which describes the site's current status and suggests ways to make it more smelling of its past. For the vineyard/grove complex, the current situation is not unusual: "Present uses...are commercial and industrial." Then comes word of what seems to be a minor miracle: "One tall slender grapefruit free...has been preserved and relocated in the courtyard of the Japanese American Cultural and Community Center..." Suggestions for recapturing more of the past proposed by The Power of Place include returning orange trees to the Wolfskill site and installing historical markets on the Vignes site. K={qU[_O
l$*=<tV
QFPfIb/
76. The author uses the phrase "civic feelings" (line 1 ) to mean the 7{oe ->r
A. loyalty or faith of a city's residents to their city CJaKnz
B. emotions that breed courtesy and good behavior !5}l&7:(MN
C. respect for each other shown by people who think of themselves as civilized WqrgRpM{
D. defensiveness that city residents sometimes. 0(8H;T
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77. What is the danger of allowing the development of Los Angeles to "run unchecked"? (line 3 ) =\,
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A. The roadways will become overrun with traffic. iO1nwl !#
B. Developers will use up all suitable farming land. ]>i~6!@
C. Smog will become an even bigger environmental concern. p3^jGj@
D. Much of the city's cultural history will be lost to modernization. VyG4(Xva
1U\$iy8}
78. With which of the following statements about the people memorialized by most existing Los Zt3}Z4d
Angeles monuments would Dolores Hayden be most likely to agree? N?4q
I. They were usually of a higher social class than were the people highlighted by The Power _DPOyR2
of Place smAC,-6]~
II. Their accomplishments are more conspicuous than are those of the people highlighted by %1McD{
The Power of Place. ,je`YEC
III. They made greater contributions to the economic development of Los Angeles than did @nV5.r0W}B
the people highlighted by The Power of Place. dpN@#w
A. I only 3mt%!}S
B. I, II, and III KT*:F(4`
C. I and III oholt/gb+0
D. I and II 0WxCSL$#I
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79. Which of the following statements most accurately characterizes Hayden's view on historic {6vEEU
preservation, as those views are described in the passage? GSVdb/+
A. Political and economic considerations should have no place in the designation of cultural Z&yaSB
and historic landmarks 0??Yr
B. Plants and other natural phenomena make better historic landmarks than do buildings and EH9Hpo
other human artistic works. Nofu7xiDw[
C. Some parts of history cannot be memorialized in surviving buildings and landmarks, so "4}wnu6/
new ways must be found to more fully recapture the past. Fq,N
D. The homes and workplaces of working people should be preserved whenever possible Bmr<O!
because the history of working people is more important than that of so-called "great &,W$-[
men." ,I*X)(
80. In the author's view, all of the following would most likely be undervalued cultural landmarks H"YL
k
EXCEPT: sB*o)8
A. trees growing naturally in this place oFg'wAO.
B. endangered species of animal and plant life 'wQy]zm$
C. historic buildings in old and torn areas xl!K;Y2<
D. city hall H*U`
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Passage Five CI^|k/
Compared to animals, plants present unique problems in demographic studies. The idea of counting living individuals becomes difficult given perennials that reproduce vegetatively by sending out runners or rhizomes, by splitting at the stem base, or by producing arching canes that take root where they touch the ground. In these ways some individuals, given sufficient time, can extend out over a vast area. ,w\ wQn>]K
There are five typical plant life spans, and each has a basic associated life form. Annual plants live for 1 year or less. Their average life span is 1-8 months, depending on the species and on the environment where they are located (the same desert plant may complete its life cycle in 8 months one year, and in 1 month the next, depending on the amount of rain it receives). Annuals with extremely short life cycles are classified as ephemeral plants. An example of an ephemeral is Boerrhaviarepens of the Sahara Desert, which can go from seed to seed in just 10 days. Annuals are herbaceous, which means that they lack a secondary meristem that produces lateral, woody tissue. They complete their life cycle after seed production for several reasons: nutrient depletion, hormone changes, or inability of nonwoody tissue to withstand unfavorable environmental conditions following the growing season. A few species can persist for more than a year in uncommonly favorable conditions. Sb<\-O14"
Biennial plants are also herbaceous, but usually live for 2 years. Their first year is spent in vegetative growth, which generally takes place more below ground than above. Reproduction occurs in the second year, and this is followed by the completion of the life cycle. Under poor growing conditions, or by experimental manipulation, the vegetative stage can be drawn out for more than 1 year. DzDj)7
Herbaceous perennials typically live for 20-30years, although some species have been known to live for 400-800 years. These plants die back to the root system and root crown at the end of each growing season. The root system becomes woody, but the above-ground system is herbaceous. They have a juvenile, vegetative stage for the first 2-8 years, then bloom and reproduce yearly. Sometimes they bloom only once at the conclusion of their life cycle. Because herbaceous perennials have no growth rings, it is difficult to age them. Methods that have been used to age them include counting leaf scars or estimating the rate of spread in tussock (clumped) forms. kO3`54
Suffrutescent shrubs (hemixyles) fall somewhere between herbaceous perennials and true shrubs. They develop perennial, woody tissue only near the base of their stems; the rest of the shoots system is herbaceous and dies back each year. They are small, and are short-lived compared to true shrubs. ,Aa|Bd]b
Woody perennials (trees and shrubs) have the longest life spans. Shrubs live on the average 30-50 years. Broadleaf trees (angiosperm) average 200-300 years, and conifer (needles) trees average 500-1000 years. Woody perennials spend approximately the first 10% of their life span in a juvenile, totally vegetative state before they enter a combined reproductive and vegetative state, achieving a peak of reproduction several years before the conclusion of their life cycle. 5RhF+p4
Regardless of the life span, annual or perennial, one can identify about eight important age states in an individual plant or population. They are: (1) viable seed, (2) seedling, (3) juvenile, (4) immature, (5) mature, (6) initial reproductive, (7) maximum vigor (reproductive and vegetative), and (8) senescent. If a population shows all eight states, it is stable and is most likely a part of a climax community. If it shows only the last four states, it may not maintain itself and may be part of a seral community. p{H0dj ^|
XJFnih
81. The author believes that plants present "unique problems in demographic studies" (line 1) @\!!t{y
because ________. {!K;`I[]v
A. they cannot be aged accurately r@$B'CsLj
B. it is difficult to define and identify an individual 3X'WR]
C. many have very short lifespans |!b9b(_j9
D. there has been little interest in such studies hAa[[%wPhU
YC)hX'A\
82. The best definition of ephemeral (line 5 ) might be R~c1)[[E
A. resilient #:W%,$9\P
B. short-lived 7|~:P$M
C. awkward 33M}>$ZH
D. uncomplicated 4<yK7x
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