【題目】 ______ scientists have learned a lot about the universe, there is much we still don't know.

A. Once B. Since

C. Though D. Unless

【答案】C

【解析】試題分析：句意：雖然科學家已經(jīng)了解到很多有關宇宙的知識，但是，我們?nèi)匀徊恢赖倪�有很多。A一旦；B既然，自從；C雖然；D除非。once和unless表示條件，since表示原因或時間；though表示讓步或轉(zhuǎn)折。這里是轉(zhuǎn)折含義，故選C。

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