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In certain area, during certain period, the development of communication could ______ the ..
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鼠类可以作为传染源引起()。A、发疽病B、疟疾C、黄热病D、.....
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Four years of service entitle Jack ______ a pension.A.onB.inC.atD.to..
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平衡膳食的要求不包括A、食物多样化B、少喝甜饮料C、合理的膳.....
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维生素中有"前激素"或"激素原"之称的是A、维生素AB、维生素DC.....
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A German firm is making a take-over______ for a .....
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