2. 外语
  3. The author’s main point in paragraph 1 is that clay deposits According to the passage, rock breaks down into clay under all of

The author’s main point in paragraph 1 is that clay deposits According to the passage, rock breaks down into clay under all of

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问题  The author’s main point in paragraph 1 is that clay deposits
  According to the passage, rock breaks down into clay under all of the following conditions EXCEPT when
选项 A、it is exposed to freezing and thawing
B、roots of trees force their way into cracks
C、it is combined with alkalies
D、natural forces wear away the Earth’s crust
答案C
解析
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