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
参考答案:D
解析: 本题空格处讲的是野生动植物保护区,应用“wildlife reserve野生动植物保护区(具体概念)”;而wildlife conservation是对野生动植物的保护(抽象概念);maintenance的意思是“维护,保持”;storage的意思是“贮藏(量)”。可见D项为正确答案。