The author mentions "It takes 2 000 liters of water to grow a kilo of vegetables but 15 00
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The author mentions "It takes 2,000 liters of water to grow a kilo of vegetables but 15,000 liters to produce a kilo of beef and people are eating more meat. "(Line 4~7, Para. 2) to______.
A．highlight the importance of new green revolution for our lives
B．urge people to take effective actions to solve water shortage
C．emphasize changing diets mainly contributes to water problems
D．warn people of the trouble of population growth in the future
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正确答案：C
篇章结构题。根据题干提示定位到原文第二段第一句：Asourexplains，manywaterproblemshaveglobalcauses：populationgrowth，climatechange，urbanizationand，especially，changingdiets．此处提到许多因水引起的问题具有其全球性的原因，比如人口增长，气候变化，城市化，特别是饮食的改变。随后文章用此例来说明饮食的改变造成的用水问题，因此选[C]项。[A]项和[D]项中提到的绿色革命和人口问题虽然在下文有所提及，但并非作者试图通过此例要证明的问题;[B]项在文中未涉及。