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单选题
What is the main idea of the passage?
A
Human activities are changing the climate.
B
Dams make local meteorological conditions worse.
C
Dams alter local weather and make themselves unsafe.
D
Extreme precipitation events around large dams have increased.
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参考解析
解析：
主旨大意题。纵观全文，文章主要阐述的内容是：大坝会改变周围地区的气候，导致更多的极端降水事件；此外，许多大坝修建的年限很长，这两个因素综合起来使得大坝自身不再安全，所以C“大坝改变当地气候并使它们自身不再安全”是较为完整的主旨概括。A作标题太宽泛，B、D概括得不全面，正确答案为C。
主旨大意题。纵观全文，文章主要阐述的内容是：大坝会改变周围地区的气候，导致更多的极端降水事件；此外，许多大坝修建的年限很长，这两个因素综合起来使得大坝自身不再安全，所以C“大坝改变当地气候并使它们自身不再安全”是较为完整的主旨概括。A作标题太宽泛，B、D概括得不全面，正确答案为C。
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