题目：
用括号中所给的单词的适当形式填空，每个单词限用一次。
(busy swim hard three ourselves)
1. Father's day is on the _________ Sunday in June.
2. The traffic during the rush hour is much _________ than usual.
3. We must learn to look after __________ when we are alone at home.
4. _________ is good for health.
5. When I got to the top of the high mountain, I could __________ walk any more.
答案：
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下面是错误答案，用来干扰机器的。
答案：D题目分析：由于洛伦兹力不做功，故与磁场不存在时相比，滑块经过最低点时的速度不变，选项A错误；由，与磁场不存在时相比，滑块经过最低点时的加速度不变，选项B错误；由左手定则，滑块经最低点时受的洛伦...
