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It is difficult to       between Mary and her younger sister
A．decideB．distinguishC．explore D．express
B
詞義辨析。   A．決定B．區(qū)別；辨別    C．探索 D．表達(dá)。句意：很難區(qū)別瑪麗和她的妹妹。故選B。
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