问题
单项选择题
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
答案
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。