更新时间：2018-12-04 07:34作者：李一老师
exempt: adj. 被免除的
down-to-earth: adj. 实际的，实实在在的
carbon dioxide: n. 二氧化碳
万能句型：
This is a very interesting cartoon, in which...
A recent report also supported this view by...
We are sad to perceive that...
It is high time for...