填空题

The layer that serves to shield Earth from the Sun’s harmful ultraviolet rays is called ______.

【参考答案】

the stratosphere
<上一题 目录 下一题>
热门 试题

填空题
The most important factors necessary to lower population growth rates in the developing world are ______.
填空题
Increased ultraviolet radiation would lead to a growing number ______.
相关试题