2. 外语
  3. In the summer of 1978, an English farmer discovered in his field that ______. One explanation given by scientists for the crop

In the summer of 1978, an English farmer discovered in his field that ______. One explanation given by scientists for the crop

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问题 In the summer of 1978, an English farmer discovered in his field that ______.
One explanation given by scientists for the crop circles is that they are made by ______.
选项 A、airplane crashes
B、air movement
C、unknown flying objects
D、new farming techniques
答案B
解析 题干意为“其中科学家们给出的一个解释是什么”。从文章的最后一段的第二句话Some scientists say that a downward rush of wind leads to the formation of the circles可知，有些科学家们说这些圆圈图案的形成可能是气流的向下急速流动而导致的。所以本题的正确答案为B。
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