Water fleas, rotifers and seed shrimps are ______.
A．food of the birds
B．enemies of the birds
C．different kinds of fish
D．waterborne invertebrates

A.
A．food
B.enemies
C.different
D.waterborne

【参考答案】

D
根据题干的waterfleas，rotifersandseedshrimps定位到第三段第二句，下一句以th......

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