These national parks are very important for preserving many animals, which would        run the risk

of becoming extinct.[ ]

A. instead        

B. therefore        

C. nevertheless        

D. otherwise

年龄相关性白内障中下列哪项描述不正确（）。

A.皮质性白内障按发展过程分为四期

B.肿胀期可诱发急性闭角型青光眼

C.成熟期可诱发葡萄膜炎

D.过熟期可引起继发性青光眼

E.核性白内障发病年龄较早，进展缓慢