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51. It is clear that the whole world is passing through a social revolution in which a central _____ must be taken by scientists and technologists.
A. process B. attention C. measure D. part
[答案]D. part.
[注释]take part in参加。
本题译文：显然，整个世界正经历着一场社会革命;科学家和技术人员必定是这场革命地主要参加者。
52. The farmers were more anxious for rain than the people in the city because they had more _____.
A. at length B. at last C. at stake D. at ease
[答案]C. at stake.
[注释]at stake(=to be won or lost; risked, depending upon the result of sth.)在危险中;利害攸关;His life itself was at stake.(他的生命本身濒临危险。); at last最终;at length详细地;at ease安详，自在，随便，不拘束：She knew he was not at ease.(她知道，他并不自在。)
本题译文：农民们比城里人更渴望鱼，因为雨水对农民来说关系更大。
53. When the big bills for mother's hospital care came, father was glad he had money in the bank to _____.
A. fall short of B. fall through
C. fall back on D. fall in with
[答案]C. fall back on.
[注释]fall back on求助于。参阅Ⅲ.48注释。
Fall short of没达到，低于：1)He fell short of what we had expected.(他没有达到我们的期望。) 2)The measures proposed fall far short of what is required.(所提出的这些措施远没达到需要的 目标。)Fall in with与......一致，符合;同意，赞成，支持。Fall through落空。参阅Ⅲ.49注释。
本题译文：母亲在医院就医的各种帐单送来时，父亲高兴的是他可用银行里的存款来支付。
54. These plastic flowers look so _____ that many ...
