37 Amphibians lay their eggs
A in any stream they can find,
B in places without UV light,
C only on sand.
D only in the right conditions
38 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 cant bear the cold of winter.
39 Coal miners once used the canary bird to detect
A poisonous gases.
B air pollution.
C water leakage.
D radiation.
40 Scientists think that the decline of amphibians could
A cause environmental change.
B cause a decline in other kinds of animals.
C be a warning signal for human beings.
D be a good sign for human beings.
参考答案:36 C 37 D 38 B 39 A 40 C
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