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、new farming techniques
C、unknown flying objects
D、air movement

答案D

解析 题干意为“科学家们给出的一个解释是麦田圈是由什么产生的。”文章最后一段第二句话说a downward rush of wind leads to the formation of the circles即一股下沉的风导致了这些“麦田圈”的出现,下沉的风属于空气流动,所以本题的正确答案为D。
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