Question

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

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。