科普类阅读理解模拟训练（一）
本文作者： 江西省赣县南塘中学 刘洪生
Passage 1For thousands of years, people have seen things in the sky and not known what they were. You can read about strange sightings in old books. Today we call the things people see UFOs. “UFO” stands for “Unidentified (身份不明的) Flying Object”. |  |
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