In the summer of 1978 an English man named Steven was driving his tractor through a field

In the summer of 1978 an English man named Steven was driving his tractor through a field of wheat when he discovered something strange. Some of his wheat was lying on the ground. The flattened wheat formed(形成)a circle about six meters across . Around this circle were four smaller circles of flattened wheat.
　 Three years later a farmer who lived nearby discovered almost the same circles in one of his fields. These circles were larger—nearly 15 meters across . That same year , another English farmer discovered three circles of flattened wheat on his land—one large circle between two small circles. During the following years, farmers in England found circles in their fields more and more often.
　 The circles are called “crop circles” because they usually appear in fields of wheat or corn. The wheat in the circles lies on the ground but is never broken; it keeps on growing, and the farmers can later harvest it. Farmers always discover the crop circles in the morning, so the circles probably form at night. They appear only in the months from May to September. What causes the crop circles?
　 At first, people thought that some kids were making them as a joke, or that farmers were making them to attract tourists.(In fact, in 1991, two men said they made the circles themselves, but many scientists don’t believe them.) People tried to copy them: They tried to make circles exactly like the ones the farmers had found. They couldn’t do it. They couldn’t enter a field of wheat without leaving tracks, and they couldn’t flatten the wheat without breaking it.
　 Several times people reported seeing stranger objects near the fields where crop circles later appeared. Many people believe that these crop circles are the messages sent by living things from outer space(外层空间)or the marks left by their spaceships.
　 Scientists who have studied the crop circles try to find out what causes them. In the summer of 1990 some scientists spent three weeks in the part of England where many circles have appeared. They had all the latest high-tech equipment(最新高科技设备). The equipment—worth 1.8 million dollars—got nothing. But one night, as the scientists were watching a field, crop circles formed in the field behind them, which were quite different from the others. The scientists had neither seen nor heard anything.
　 When Steven discovered the crop circles on his land in 1978, he said, “It was just like something that had landed in the field from the air and gone back up again. I don’t know what to make of these things.”
　 Crop circles have appeared in England, Japan, the United States and Russia. Experts from all over the world have studied them, and they say what Steven said: They don’t know what to make of these things.
【小题1】Which picture is probably the one formed in the field behind the scientists?

【小题2】“Flattened wheat” means .
　　 A．broken wheatB．lying wheat
　　C．harvested wheatD．growing wheat【小题3】The passage is mainly about something .A．that is done by living things from outer spaceB．that cannot be solved but found all around the worldC．that cannot be made clear or understoodD．that is discovered and copied by the farmersA

(答案→)A 解析：【小题1】根据第一段可知，B项是1978年发现的；根据第二段前两行可知，D项是1980年发现的；根据第二段倒数第二行可知，C项是1980年发现的；根据倒数第三段最后两行可知，科学家发现的怪圈和以前发现的不同。故选A。【小题1】根据第三段前三行可知，“Flattened wheat”倒着的麦子，并没有断掉，还能继续生长。故选B。【小题1】文章主要介绍的一些奇怪的现象，至今未能得到科学的解释。C项意为“一些不能被说清楚和理解的事情”，符合题意。故选C。

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