【问】 请说明alternate与alternative的差别。
 【答】 alternate的意思是“交替的”、“每隔一……”。
 1. He works on alternate days. (LDCE)
 他隔天工作。
 2. alternate laughter and tears(ALD)
 时笑时哭
 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”：
 1. We returned by the alternative road. (LDCE)
 我们从另一条路回来。
 2. It will take time to develop alternative energy sources. (WTYB)
 开发其他的能源是需要时间的。
 3. There are alternative answers to your question. (OSD)
 你的问题有几个可供选择的答案。
 请做下列的英语试题：
 1. 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 sourees
 2. 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
 3. It is advisable to have an alternative plan.
 A. a substitute B. a better
 C. an easier D. an equal
 4. Neither of the alternatives that at acceptable the executive committee. (TOEFL 教程)
 (参见 neither)