All these reasons for the disappearance of amphibians are also good reasons for more general concern. The destruction of land， the pollution of the air and the water， the changes in our atmosphere， the spread of diseases - these factors affect human beings， too. Amphibians are especially sensitive to environmental change. Perhaps they are like the canary (金丝雀) bird that coal miners once used to take down into the mines to detect poisonous gases. When the canary became ill or died， the miners knew that dangerous gases were near and their own lives were in danger.

　　36 Losing amphibians means losing

　　A.knowledge about fatal human diseases.

　　B.knowledge about air and water pollution.

　　C.a chance to discover new medicines.

　　D.an opportunity to detect poisonous gases.

　　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

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