2. 外语
  3. Sedimentary rocks cover much of the Earth’s surface, but they are often hidden by a thin veneer of soil.

Sedimentary rocks cover much of the Earth’s surface, but they are often hidden by a thin veneer of soil.

admin2010-01-14  54
问题 Sedimentary rocks cover much of the Earth’s surface, but they are often hidden by a thin veneer of soil.
选项 A、concealed
B、eroded
C、protected
D、softened
答案A
解析
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