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In 2050, one of the biggest challenges of mankind is______.
A.to provide food for at least 9 billion people
B.to develop more cultivable land
C.to produce treble food on roughly the same area of land
D.to prevent droughts and floods

A.
A.to
B.to
C.to
D.to

【参考答案】

A
根据题干关键词定位到第三段第三句:Oneofthebiggestchallengesfacingmankindistofeedthe9billion-10billionpeoplewhowillbealiveandricherin2050。此句意为“人类面临的最大挑战之一是到2050年,......

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