32（）A．notB．noC．noneD．little

25（）A．killB．beatC．holdD．catch

单项选择题25（）

A．kill
B．beat
C．hold
D．catch

What does the second paragraph mainly discuss（）A．Some a...

单项选择题What does the second paragraph mainly discuss（）

A．Some animals and plants depend on each other for existence.
B．Some animals and plants develop their relationship easily.
C．Some plants depend on each other for food.
D．Some animals live better together.

21（）A．importantB．impossibleC．impoliteD．interesting

单项选择题21（）

A．important
B．impossible
C．impolite
D．interesting