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    ---__________ it is from our own planet Earth to Mars!

    ---Yes, it takes months to travel to Mars by spacecraft.

    A. How soonB. How far

    C. How longD. How often

     

    B

    【解析】

    试题分析：句意：从我们地球到火星有多远？乘宇宙飞船到火星旅行需要好几个月的时间。A. How soon多久？提问in+一段时间； B. How far多远，提问距离；C. How long多长，提问for+一段时间 D. How often提问多久一次，对频度的提问根据句意，故选B。

    考点：考查疑问词组的用法。

     

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