A-A+
Some scientists have suggested that Earth is a
问题详情
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
正确答案：D
解析：wildlife reserve野生动植物保护区(具体概念)；wildlife conservation对野生动植物的保护(抽象概念)；maintenance维护，保持；storage贮藏(量)。
