看图片,选句子
A. Whose storybooks are these?
B. John is jumping.
C. Who is singing?
D. Look !Zoom is eating watermelon.
E. It is drinking water.
____
PM2.5是指大气中直径小于或等于0.0000025m颗粒物,它们含有大量的有毒、有害物质,对人体健康危害很大,0.0000025m用科学记数法可表示为____ m.
一个数的相反数是2,则这个数是( )
读地质剖面示意图,回答下列各题。