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

試題分析：A否則，要不然；B因此；C然而；D代替，而不是；句意：對(duì)于保護(hù)很多野生動(dòng)植物來(lái)說(shuō)自然保護(hù)很重要，要不是這些動(dòng)植物會(huì)有滅絕的危險(xiǎn)。根據(jù)句意說(shuō)明A項(xiàng)符合上下文。
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