Look, you can see many _________ in the pool. And here is some ________for you to keep them.
A:fish; suggestion
B:fishes; advices
C:fish; advice
D:fishes; suggestions
下列事实,用分子、原子的观点解释合理的是( )
我国水旱灾害频繁的根本原因是( )
如图,∠APD=90°,AP=PB=BC=CD,则下列结论成立的是( )