Don't .( )
A:litter
B:open the gate
C:throw stones
14×50= 492+18= 25×36= 21×101=
(0+1)×210= 45×11-45= 660÷5÷2= 82-(25-18)=
4500÷300= 75-75÷3= 53+47×0= 134-34-50=
-It's important for us to know _________ all the subjects. -Yeah, group work is my favorite.
图中阴影部分表示四种植物的共同特征,这一特征是( )