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单选题
Mount Rushmore needs to be ______.
A

protected from air pollution

B

polished for tourists

C

closed during the winter

D

repaired periodically


参考答案

参考解析
解析:
文章最后一段描述到每年冬天冰雪融水就会流进裂痕,当水结冰时就会膨胀从而使裂痕变得更大,因此每年都会开展维修工作(maintenance work)来填补裂缝。D项为正确答案。periodically定期地,周期性地。
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