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  3. UFOs There are many explanations for why UFOs visit the Earth. / The most popular one is that they may be visitors from ot

UFOs There are many explanations for why UFOs visit the Earth. / The most popular one is that they may be visitors from ot

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答案 UFOs There are many explanations for why UFOs visit the Earth. / The most popular one is that they may be visitors from other planets./To fly such aircraft, their builders must develop different forms of aviation,/because they seem to fly much faster than normal aircraft./The UFOs, it is believed, must contain scientists/from other planets who are studying life on earth./It is even believed that several such aircrafts may have landed on earth/and file space visitors may be living amongst us./ But there are also less fantastic explanations available./Although some sightings of UFOs are-difficult to explain, most can be explained quite easily./In many cases the observers might have made a mistake./They might have seen a weather balloon or an aircraft./Or the light they saw in the sky might have been light from the ground,/reflected onto the clouds./ However, the exact cause of many sightings still remained a mystery./
解析 本文的难点主要是表示推测的几个句子。第一段最后一句中several such aircraft may have landed on earth和第二段第三，四、五句中的might have ＋V-ed可能会给听写造成困难，因为表示对过去的推测时have都轻读，[h)的读音省略，与前边的情态动词连读。如果不熟悉这一语音现象，错误很可能就会发生。补救的措施仍然是进行快速的语法分析。
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