单选题The main reason of building a space elevator instead of using rockets is that .选项：

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单选题The main reason of building a space elevator instead of using rockets is that .选项：

A.the technology needed in building a space elevator is easier than that of rockets

B.the safety of a space elevator is better than that of rockets

C.the cost of building a space elevator is a fraction of using rockets

参考答案：C

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