【題目】The journey to Mars takes months because the spacecraft flies too slowly.

A. first of all B. in the future C. at present D. in the past

【答案】C

【解析】句意：目前去火星的旅行花費幾個月的時間，因為宇宙飛船飛行地太慢了。A. first of all首先；B. in the future在未來；C. at present目前；D. in the past在過去。根據(jù)謂語動詞takes可知，這里敘述的是現(xiàn)在的事情，故選C。

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