2. 外语
  3. The boiling water in the kettle decreases because it ______ into vapor. In other words, it is vaporizing or evaporating.

The boiling water in the kettle decreases because it ______ into vapor. In other words, it is vaporizing or evaporating.

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问题 The boiling water in the kettle decreases because it ______ into vapor. In other words, it is vaporizing or evaporating.
选项 A、is being converted
B、is converted
C、has been converted
D、converts
答案A
解析 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。
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