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


  1. A.
    otherwise
  2. B.
    therefore
  3. C.
    though
  4. D.
    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)植物來說自然保護(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)句意說明A項(xiàng)符合上下文。
考點(diǎn)：考察副詞詞義辨析
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