单选题
Which of the following may prove that the crop circles are not made by man?
A、
The farmers couldn't step out of the field
B、
The farmers couldn't make the circles round
C、
The farmers couldn't leave without footprints
D、
The farmers couldn't keep the wheat straight up
【正确答案】
C
【答案解析】
[精析] 推断题。题干意为“下列哪一项能够证明这些庄稼圈升非人类所为”。从文章的第三段最后一句话They couldn't enter a field of grain without leaving tracks可知，人们是不可能不留下任何印记而进入庄稼地的。所以本题的正确答案为C。
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