单选题
From the passage we know that "the greenhouse effect" is an effect in which ______.
A、
low temperatures are created by using a house
B、
the house is made green in order to keep heat
C、
heat is prevented from escaping outside
D、
everything is kept green in a house
【正确答案】
C
【答案解析】
从文章第二自然段开头，我们可以看出，由于the green house effect(温室效应)致使the gas prevents the escape of heat into outer space，即大气阻碍了热量散放到外部空间。故应选C。
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