请说明 alternate 与 alternative 的差别。
alternate 的意思是“交替的”“每隔一……”。
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He works on alternate days. (LDCE) 他隔天工作。
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alternate laughter and tears(ALD) 时笑时哭
注意, alternate 还可用作及物动词和不及物动词。
alternative 的意思是“其他的”“可替代的”“两种之中可供选择的”“几种之中可供选择的”：
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We returned by the alternative road. (LDCE) 我们从另一条路回来。
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It will take time to develop alternative energy sources. (WTYB) 开发其他的能源是需要时间的。
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There are alternative answers to your question. (OSD) 你的问题有几个可供选择的答案。
请做下面的英语试题：
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Alternative sources of protein must be found when meat and fish are not available. A. New sources B. Less expensive sources C. More sources D. Other sources
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There is no alternative: the President must approve the bill if Congress passes it. A. chance of agreement B. doubt C. other choice D. mistake
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It is advisable to have an alternative plan. A. a substitute B. a better C. an easier D. an equal
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Professor Smith and Professor Brown will ____ in giving the class lectures. A. alter B. change C. alternate D. differ(全国六级,90.1-51)
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When travelling, you are advised to take travellers' checks, which provide a secure ____ to carrying your money in cash.
A. substitute B. selection C. preference D. alternative(全国研考,96-27)