A:1:2:3
B:3:2:1
C:2:3:6
D:6:3:2
大气污染能影响气候,降低能见度,引发温室效应、臭氧层空洞和酸雨。
— What are you going to do if it______ tomorrow?
—I haven't thought about it.
作者描写人物方法有____、____、____、____;