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    【题目】Some scientists don't deny the existence of aliens ,but further evidence is still needed to _____ it.

    A. compromise B. confirm

    C. commit D. concern

    【答案】B

    【解析】考查动词辨析。A. compromise妥协；B. confirm确认，证实；C. commit犯罪，指派； D. concern涉及，关心。句意：一些科学家并不否认外星人的存在，但是进一步的证据仍需证实。表示证实证据，故选B.

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