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

admin2010-01-14  51

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
转载请注明原文地址:https://kaotiyun.com/show/Quhd777K
0

最新回复(0)