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单选题
It is not feasible to build sea defenses to protect against erosion because _____.
A
it is too costly and will endanger neighbouring areas
B
the government is too slow in taking action
C
they will be easily knocked down by waves and currents
D
house agents along the coast do not support the idea
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解析：
细节推断题。文章第三段第二句指出，政府勘察人员说建拦海大坝是不可能的，不仅要花费数亿英镑的高额费用，而且如果建起海防会使海浪沿着海岩向前涌去，把问题从一个地区移向另一个地区。通过比较，A项符合文意。
细节推断题。文章第三段第二句指出，政府勘察人员说建拦海大坝是不可能的，不仅要花费数亿英镑的高额费用，而且如果建起海防会使海浪沿着海岩向前涌去，把问题从一个地区移向另一个地区。通过比较，A项符合文意。
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