2. 外语
  3. This article mainly talked about ______. According the passage, the main threat to the mammals is ______.

This article mainly talked about ______. According the passage, the main threat to the mammals is ______.

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问题 This article mainly talked about ______.
According the passage, the main threat to the mammals is ______.
选项 A、the polluted marine environment
B、the global warming
C、the human beings
D、the slow-breeding rate
答案C
解析 这是一道细节题。答案在文章第二段最后一句Trouble has closed in on these mammals in the form of equally warm-blooded and even more efficient and adaptable predators， humans中。
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