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

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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