2. 外语
  3. A population explosion will lead to ______. ______, the world may have population of 12 billion in a century.

A population explosion will lead to ______. ______, the world may have population of 12 billion in a century.

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问题 A population explosion will lead to ______.
______, the world may have population of 12 billion in a century.
选项 A、If man can live longer in the future
B、If the science of medicine is developing fast enough
C、If the population growth is not reduced
D、If the earth is able to provide a good life for more people
答案C
解析 本题为细节题，信息点定位在最后一段第四句“Unless population growth is reduced， the world population may reach 12 billion in a century．”，此处Unless相当于if not，因此选C。
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