The place is very popular. Look, there are so many _______ here.
A:visitor
B:travelers
C:policemen
D:actors
— Can you play ping-pong _____ basketball?
— I can play ping-pong.
如图所示,甲、乙、丙三只相同的杯子,分别盛有质量相同的水、酒精和盐水,则甲、乙、丙杯子中所盛的液体分别是( )
细胞学说的要点不包括 ( )
下列关于动物与其气体交换的场所,对应不正确的是一项是( )