单选题
In the author's opinions, which one would be the most insolvable problem caused by population growth?
A、
Lack of oil.
B、
Lack of food.
C、
Lack of space.
D、
Lack of resources.
【正确答案】
C
【答案解析】
[解析]此题的答案来源于第一段及最后一段。D选项迷惑性较大，但是通读全文，文章总的来说围绕 to look for open space somewhere else 而引出 Sagan 的实验，所以可以排除D。
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