Question

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

Answer 1

A
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