第32题: [单项选择]The boiling water in the kettle decreases because it ______ into vapor. In other words, it is vaporizing or evaporating. A. is being converted B. is converted C. has been converted D. converts 参考答案:A 答案解析:[精解] 动词时态、语态题。从第二句时态可判断出第一句时态为一般现在进行时态,从句子语意可判断出动词为被动语态,所以[B]和[D]选项是错误的,[C]选项为干扰项。由此可以肯定[A]为正确选项。