Scientists who have studied the crop circles suggested several possibilities. Some scientists say that a downward rush of wind leads to the formation of the circles - the same downward rush of air that sometimes causes an airplane to crash. Other scientists say that forces within the earth cause the circles to appear. There is one problem with all these scientific explanations: crop circles often appear in formations, like the five-dot formation. It is hard to believe that any natural force could form those.

　　In the summer of 1978, an English farmer discovered in his field that __________. A. some of his wheat had been damaged

　　B. his grain was growing up in circles. C. his grain was moved into several circles

　　D. some of his wheat had fallen onto the ground.

　　According to the text, the underlined part “hoax” (in the 3rd paragraph) probably means __________. A. an attempt made to fool people

　　B. a special way to plant crops C. a research on the force of winds

　　D. an experiment for the protection of crops.

　　Which of the following may prove that the crop circles are not made by man? A. The farmer 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.

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