【題目】Puzzled by this strange natural phenomenon, the scientists started to explore every _______ they knew to figure it out.

A. impression B. intention C. avenue D. design

【答案】C

【解析】

試題分析：考察名詞。A.印象；B.意圖；C.大道，途徑，手段；D.設(shè)計；句意：因這個奇怪的自然現(xiàn)象所困惑，科學(xué)家開始嘗試各種他們知道的方法去探索這個現(xiàn)象。故選C。

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