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Frogs are important in the ecosystem because they control pests.
A．Y
B．N
C．NG
答案
更多“Frogs are important in the ecosystem because they control pests.A．YB．NC．NG”相关的问题
第1题
A downpour of frogs occurred near______.
A．Appin, Scotland
B．Vienna
C．Hamburg
D．Liverpool
第2题
Biologists are unable to explain why frogs are dying.
A．Y
B．N
C．NG
第3题
Frogs and toads are usually poisonous.
A．Y
B．N
C．NG
第4题
The frogs' natural habitat is becoming more and more developed.
A．Y
B．N
C．NG
第5题
Which creature is higher in the food chain than tadpoles or frogs？
A．Insects.
B．Algae.
C．Eagles.
D．Snails.
第6题
第7题
He carefully zigzagged his way through the field, ______the frogs lying there.
A．avoiding
B．avoid
C．avoided
D．and avoid
第8题
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.
第9题
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．
