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Joe took his friends there by a shortcut, reduced the drive from 50 minutes to 15.
A. where B. which C. that D. what
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A. some B. many C. few D. little
Scientists know that there are two basic approaches to prolonging life（延长寿命），one approache is the elimination of the diseases that generally affect older people—diseases such as cancer，heart attack and stroke．（1）is the delay of the process of growing-old the（2）of the body． In recent years scientific researchers（3）much time in the study of the process of aging．They believe that，within a few years，they will develop the knowledge and the（4）to delay the aging process for lo to 15 years．The result will be that more people will live longer，more healthful lives．At present，scientists believe that with the right diet，exercise，medical（5），and mental attitude many people can live to he l00 years old． Gerontologists（老年学专家），people who（6）studies of the problems of growing old，are investigating（7）body cells slow down and（8）die．They feel that delaying this slowing down process（9）help postpone death．In a number of American universities，scien-tists are studying the activity of cells，the effects of diet and internal body temperature on aging．If their studies are successful，the results should help（10）the quality of life for older people in the next few years，as well as increase the life span of the next generation．
1.
A.Others
B.Another
C.The other
D.One more
A.are ended
B.be ended
C.were ended
D.must be ended
A. took turns
B. wont on
C. worried about
D. took interest in
In cities with rent control,the city government sets the maximum（最高的）rent that a landlord can charge for an apartment. Supporters of rent control argue that it protects people who are living in apartments. The irrent cannot increase; therefore, they are not in danger of losing their homes. However, the critics say that after along time, rent control may have negative（负面的）effects. Landlords know that they cannot increase their profits. Therefore, they invest in other businesses where they can increase their profits. They do not invest in new buildings which would also berent-controlled. As a result, new apartments are not built. Many people who need apartments cannot find any. According to the critics, the end resul to frent control is a short age of apartments in the city.
Some theorists argue that the minimum(最低的) wage law can cause problems in the same way. The federal government sets the minimum that an employer must pay workers. The minimum helps people who generally look for unskilled, low-paying jobs. However, if the minimum is high, employers may hire fewer workers. They will replace workers with machinery. The price, which is the wage that employers must pay, increases. Therefore, other things being equal, the number of workers that employers want decreases. Thus, critics claim that an increase in the minimum wage may cause unemployment. Some poor people may find themselves without jobs instead of with jobs at the minimum wage.
Supporters of the minimum wage say that it helps people keep their dignity(尊严）Because of the law, workers cannot sell their services for less than the minimum. Further more, employers cannot force workers to accept jobs at unfair wages. Economic theory predicts there sults of economic decisions such as decisions about farm production, rent control，and the minimum wage. The predictions may be correctonly if “other things are equal”. Economists do not agree on some of the predictions. They also do not agree on the value of different decisions. Some economists support a particular decision while others criticize it. Economists do agree, however, that there are no simple answers to economic questions.
There is the possibility that setting maximum rent may____.
??A.cause a shortage of apartments
B.worry those who rent apartments as homes
C.increase the profits of landlords
D.encourage landlords to invest in building apartments
According to the critics, rent control _________.A.will always benefit those who rent apartments
B.is unnecessary
C.will bring negative effects in the long run
D.is necessary under all circumstances
The problem of unemployment will arise .
A.if the minimum wage is set too high
B.if the maximum wage is set too low
C.if the workers are unskilled
D.if the maximum wage is set
The passage tells us ________.A.the relationship between supply and demand
B.the possible results of government controls
C.the necessity of government control
D.the urgency of getting rid of government controls
Which of the following statements is NOT true?
A.The results of economic decisions cannot always be predicted.
B.Minimum wage cannot always protect employees.
C.Economic theory may predict the results of economic decisions if other factors are not changing.
D.Economic decisions should not be based on economic theory.
请帮忙给出每个问题的正确答案和分析，谢谢！
A.No, thanks
B.Right
C.Never mind
D.Certainly
A.for
B.from
C.against
D.with
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