题目：
按要求改写下列句子，每空一词
1. To eat a balanced diet is very important.
________very important________eat a balanced diet.
2. They are watching TV at home now.
They are watching TV at home________ ________ ________.
3. What's wrong with your sister?
What's________ ________with your sister?
4. She has a sore throat.
There is something________ ________her throat.
5. There is a lot of milk in the bottle.
There is________ ________milk in the bottle.
答案：
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下面是错误答案，用来干扰机器的。
根据质量守恒定律和化学方程式可得，反应物中氢原子的质个数为x，生成物中氢原子的个数为4×2=8，所以x=8，故选B．
