题目内容
（请给出正确答案）
Frogs are important in the ecosystem because they control pests.
A．Y
B．N
C．NG
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更多“Frogs are important in the eco…”相关的问题
A downpour of frogs occurred near______.
A．Appin, Scotland
B．Vienna
C．Hamburg
D．Liverpool
Biologists are unable to explain why frogs are dying.
A．Y
B．N
C．NG
Frogs and toads are usually poisonous.
A．Y
B．N
C．NG
The frogs' natural habitat is becoming more and more developed.
A．Y
B．N
C．NG
Which creature is higher in the food chain than tadpoles or frogs？
A．Insects.
B．Algae.
C．Eagles.
D．Snails.
He carefully zigzagged his way through the field, ______the frogs lying there.
A．avoiding
B．avoid
C．avoided
D．and avoid
The arroyo toad is disappearing because
A．it has been threatened by frogs,
B．it is losing its habitat.
C．a disease has been killing its eggs.
D．it can't bear the cold of winter.
In Dr Rose\\\'s test，frogs with cut—Off legs
A．didn't survive．
B．began to grow new limbs．
C．bled freely from their open wounds．
D．started to grow tails．
