- 搜标题
- 搜题干
- 搜选项
单项选择题
A．A complicated system of several food chains.
A．A complicated system of several food chains.
B．A society that distributes food.
C．The relationship of one green plant to another.
D．The device that spiders use to catch food.
A.A
B.
B．A
C.
C．The
D.
D．The
E.
B.
B．A
C.
C．The
D.
D．The
E.
