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

A.IfB.ThoughC.SinceD.Unless

【答案】B

【解析】

句意：雖然科學家們對這個世界了解很多，但還有很多我們還不知道。

考查連詞辨析。If如果；Though 盡管；Since自從； Unless除非，如果不。根據(jù)“there is much we still don't know.”可知，此處是Though引導的讓步狀語從句。根據(jù)題意，故選B。

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