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    【题目】 ______ 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】句意：虽然科学家已经了解到很多有关宇宙的知识，但是，我们仍然不知道的还有很多。once和unless表示条件，since表示原因或时间；though表示让步或转折。这里是转折含义，故选C。

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