The reason why coal is still a very valuable source of power is______ atomic power is not available in sufficient quantity.

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问题 The reason why coal is still a very valuable source of power is______ atomic power is not available in sufficient quantity.

选项 A、because
B、that
C、as
D、for

答案B

解析本题考查连词的用法，此处需要的是引导表语从句的连词，所以用that。题意为，煤仍然是有价值能源的原因是，可用的原子能数量不充足。

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