2. 外语
  3. There may be other life forms in the universe because over 50 extrasolar planets were discovered in 2001. The animals living in

There may be other life forms in the universe because over 50 extrasolar planets were discovered in 2001. The animals living in

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问题 There may be other life forms in the universe because over 50 extrasolar planets were discovered in 2001.
The animals living in extreme oceanic environments have to feed on certain bacteria that help them get energy from______.
选项
答案the water
解析 由题干关键词bacteria，get energy可将答案定位至第二个小标题下第三段第三句。The tubeworms have bacteria in their tissues that help them derive energy from the water，原文中the water就是答案。
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