单选题
The author refers to the Venus primarily in order to ______.
A、
show the inherent weakness of the greenhouse effect theory
B、
show that the greenhouse effect works on other planets but not on the earth
C、
show the extent to which Earth's atmosphere differs from that of the Venus
D、
supper the argument that the CO
2
level in the atmosphere has a significant effect on climate
【正确答案】
D
【答案解析】
作者提到金星，主要是为了证明这一论点：大气中C0
2
低含量会对气候造成重大影响。作者在第二段第一句话提到了这一论点。他以金星为例，正是为自己的论点提供依据。
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