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    Nature reserves are very important for preserving many animals and plants, which would _______ run the risk of becoming extinct.

    A．otherwise B．therefore C．though D．instead

    A

    解析试题分析：A否则，要不然；B因此；C然而；D代替，而不是；句意：对于保护很多野生动植物来说自然保护很重要，要不是这些动植物会有灭绝的危险。根据句意说明A项符合上下文。
    考点：考察副词词义辨析

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