171. 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。
172. 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。
173. 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。
174. These plastic flowers look so _____ that many people think they are real.
A. beautiful    B. natural    C. artificial    D. similar

[答案]B. natural.
[注释]natural自然的，与后半句“许多人认为它们是真的”相呼应。
175. The managing director promised that he would _____ me as soon as he had any further information.
   A. communicate    B. notice    C. notify    D. note
[答案]C. notify.
[注释]notify通知。Notice n.通知；v.注意到；note n.笔记；v.记下，摘下。
176. When I worked as the general manager of the firm, I sometimes had _____ to visit London on business.
A. opportunity B. possibility  C. occasion D. chance
[答案]C. occasion
[注释] occasion 作可数名词时，意为“时机”，作不可数名词时，意为“必要”，本题中occasion意为“必要”。从

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