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  3. There may be other life forms in the universe because over 50 extrasolar planets were discovered in 2001. Astrobiology, a branc

There may be other life forms in the universe because over 50 extrasolar planets were discovered in 2001. Astrobiology, a branc

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问题 There may be other life forms in the universe because over 50 extrasolar planets were discovered in 2001.
Astrobiology, a branch science combining many other branches, studies the life on Earth.
选项 A、Y
B、N
C、NG
答案B
解析 由题干关键与Astrobiology可将答案定位至第一个小标题下第二段第一句。Astrobiology is the scientific study of life in the universe，以此就可以证明本题陈述中的studies the life on earth有误。
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