考博英语

transaction, guarantees on the product or service, delivery terms, return privileges, and other factors. y%wjQC 0~  
In other words, both buyer and seller should be fully aware of all the factors that comprise the total 9 M< 3m  
“package” being exchanged for the asked-for amount of money in order that they may evaluate a A4|L;z/A[h  
given price. ;_TPJy  
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Electricity ]Av)N6$&-Z  
The modern age is an age of electricity. People are so used to electric lights, radio, televisions, and Y}aa W[  
telephones that it is hard to imagine what life would be like without them. When there is a power $I$ B8  
failure, people grope about in flickering candlelight, cars hesitate in the streets because there are no  9Q.}jV  
traffic lights to guide them, and food spoils in silent refrigerators. )LRso>iOO  
Yet, people began to understand how electricity works only a little more than two centuries ago. k
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Nature has apparently been experimenting in this field for million of years. Scientists are discovering