What can we learn about the effects of acid rain on terrestrial plants?
A. Acid rain destroys the coating on tree leaves and fruits.
B. Acid rain makes tree leaves and fruits poisonous.
C. They are as clearly understood as the acid rain's effects on lakes.
D. Acid rain makes no difference on terrestrial plats.
第6题
包装按包装容器的耐变形能力分为()。
A.内包装和外包装
B.运输包装和销售包装
C.软包装和硬包装
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