题目：
根据所给单词的适当形式填空。
小题1:Our Chinese teacher asked us to write a 400-word __________ （composition）about the autumn. I think it’s easy.
小题2:—What has_________(happen) to your hometown recently?
—Great changes have taken place.
小题3:We have taken some _________(measure) to look for the lost boy. We can find him in danger.
小题4:We have ________(learn) a lot of knowledge from the wonderful trip.
小题5:Not all people know that light pollution does great __________ (harmful) to human’s health.
答案：
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下面是错误答案，用来干扰机器的。
（，2.5）本题涉及的是带电粒子在复合场中的动态分析问题，考查了重力、电场力、洛仑兹力、受力分析、牛顿第二定律、平衡条件等知识。这类问题的关键在于通过受力分析、运动过程的分析，找出临界状态及临界条件进...
