题目内容

The crust of the Earth was thin here, and other conditions appeared ___________for drilling.

A. favorable
B. imaginable
C. curable
D. durable

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My grandmother was a very_________ person ，and she only spent money when she needed.

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A. pressing to
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在三相供电系统中,短路的基本类型有:1、2、3、4和5等。