What will be the population of Tianjin according to the U. N. estimates?

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问题 What will be the population of Tianjin according to the U. N. estimates?
  
The UN estimates that the population of the Beijing metropolitan area will be approximately 12 million, and that of Tianjin will be 7 million.
Around 380 million years ago, only 300 species groups were left in existence. And still, the earth remained. It would’ve survived if only 250 or 200 groups had lived, or even 100.

选项 A、250.
B、200.
C、300.
D、100.

答案C

解析 本题的关键是数字信息的听辨和记录。根据原文“Around 380 million years ago,only 300 species groups were left in existence”,可以判断C是正确选项。
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