A:if they were interested in dinosaur
B:when was Albert Einstein bor
C:what they will do with the computer
D:how many trees they have planted
某日中午,北方某地气温由早晨的零下2℃上升了9℃,傍晚又下降了3℃,这天傍晚北方某地的气温是____ ℃.
下列有关细胞的物质基础和结构基础的阐述,错误的是( )