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  3. There may be other life forms in the universe because over 50 extrasolar planets

There may be other life forms in the universe because over 50 extrasolar planets

游客2023-09-01  73
问题 There may be other life forms in the universe because over 50 extrasolar planets were discovered in 2001. [br] Because people have not convincingly found any alien life forms, such forms are just our_____.
选项
答案 imagination
解析 题干关键词与原文conclusively discovered 同义，alien life forms与原文alien physiology同义，因此将答案定位至第三个小标题Speculation：What Might Aliens be Like?下第一段第一句。Since no extraterrestrial life forms have been conclusively discovered，alien physiology lies in the realm of our imagination，据此，空格里可以填入imagination。
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