单选题Mount Rushmore needs to be ______.Aprotected from air pollutionBpolished for touristsCclosed during the winterDrepaired periodically
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。
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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