题目内容

根据煤层和赋存特征和开采技术条件，煤矿的开采方法有（)和（)两种。

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Wellman was there for his able－bodied friend early in the climb when pieces of rock _______ .

A. made up
B. gave in
C. made out
D. gave way

长用的掏槽方式有（),（)和（)三种。

回采巷道是指形成（)及其服务的巷道。

Wellman said he is not trying to send any _______ to disabled people by climbing.

A. message
B. suggestion
C. movement
D. present