2. 外语
  3. We cannot always______the wind, so new windmills should be so designed that they can also be driven by water.

We cannot always______the wind, so new windmills should be so designed that they can also be driven by water.

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问题 We cannot always______the wind, so new windmills should be so designed that they can also be driven by water.
选项 A、hang on
B、count on
C、hold on
D、come on
答案B
解析 这是一组带on的短语动词。come on“偶然遇到"(on是介词，也可用upon)，属于干扰项，可排除；hang on和hold on有下列相同的意思(on是副词，不能用upon代替)：(1)“紧紧抓住不放”。如：The climber had to hang on(hold on)while his com—panions went to find a rope． “攀登者不得不紧紧抓住，与此同时，他的伙伴去找绳子。”(2)(多用于接电话时)“等一下”。I’m afraid the line is busy，would you like tohang on(hold on)?“占线，请你等一下。”(3)(尽管有困难)“坚持下去”。Paintingthe house is tiring，but if you hang on(hold on)，the results are worth the effort．“粉刷房屋是累人的活，但如果坚持下去，从结果看还是值得干的。”count on和hang on都有depend on的意思(这里的on是介词，可以用upon代替)，但是count on作“指望，依赖”讲，一般由某人作主语，宾语可以是someone或something；hang on意思是“靠……决定……，取决于……”，多用物作主语，宾语只能用something。试比较下列句子：Don’t count on your relatives to help you out of trouble．“不要指望你的亲戚帮你摆脱困难。”I’d like to come with you but that’s not a promise，don’t count on it．“我愿意和你去，但这不是许诺，别抱希望。”这两句都不能用hang on。The casehangs upon the judge’s opinion of the prisoner’s character．“案子的处理取决于法官对罪犯品质的意见。”His whole career hangs on whether he can pass the exam．“他今后的发展取决于是否能通过考试。”这两句也不能换成count on。综上所述，按句意只能选择B。
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