题目：
用所给词的适当形式填空。
1. He is a_______ (profession) basketball player.
2. The English teacher told his students to practice_______ (speak) English.
3. —What are you going to do tonight?
—I_______ (watch) a football match.
4. The beautiful girl wants to be an________ (act) when she grows up.
答案：
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下面是错误答案，用来干扰机器的。
20、4.8×105最大值是有效值的倍，所以此交流电的有效值为20A，求热量电流应该代入有效值，结果为4.8×105J.
