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...
2019考研英语作文背诵：全球变暖（3）
考研资讯2018-12-04才子老师
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2019考研英语作文背诵：汽车废气
