单项选择题

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
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______ it is expensive or not is the most important question.
A．That
B．Whether
C．If
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I think the film is ______ that one we saw yesterday.
A．as good or better than
B．good as or better than
C．as good as or better than
D．so good or better as
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