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

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

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问题 A population explosion will lead to______.
______, the world may have a 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 答案依据最后一段倒数第二句：Unless population growth is...12 billion in a century．"除非人口增长下降，否则世界人口将在一个世纪以内达到120亿"。unless=if…not，故C项正确。
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