---__________ 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】

試題分析：句意：從我們地球到火星有多遠？乘宇宙飛船到火星旅行需要好幾個月的時間。A. How soon多久？提問in+一段時間； B. How far多遠，提問距離；C. How long多長，提問for+一段時間 D. How often提問多久一次，對頻度的提問根據(jù)句意，故選B。

考點：考查疑問詞組的用法。

 

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