2. 外语
  3. ______ crumbles readily when exposed to a moist, acid atmosphere, but the stone is durable in a dry atmosphere.

______ crumbles readily when exposed to a moist, acid atmosphere, but the stone is durable in a dry atmosphere.

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问题 ______ crumbles readily when exposed to a moist, acid atmosphere, but the stone is durable in a dry atmosphere.
选项 A、The surface of marble is
B、The surface of marble, which
C、Although the surfitce of marble
D、The surface of marble
答案D
解析
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