Some scientists have suggested that Earth is a kind of zoo or wildlife () for intelligent space beings, like the wilderness areas we have set up on earth to allow animals to develop naturally while we observe them.

A. conservation

B. maintenance

C. storage

D. reserve

腭裂给患儿造成的影响是（）

A.吮吸功能障碍

B.语音不清

C.口鼻腔相通

D.易引起上呼吸道感染

E.自卑心理