According to the speaker, how do developers contribute to the reduction of amphibian population?

A．By taking over ponds.

B． By constructing sewers.

C． By building dams on rivers.

D． By flooding marshes.

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1 According to the speaker, how do some pesticides get into ponds?

A． They are applied to aquatic weeds by fish farming.

B． Amphibians release them from their skin.

C． Irresponsible dispose of them in ponds.

D． They are washed into ponds by the rain.

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2 According to the speaker, why do pesticides pose a threat to amphibians?

A． Pesticides can cause an amphibian's skin to dry out.

B． Pesticides kill the insects that amphibians depend on for food.

C． Dissolved pesticides can easily enter amphibian's bodies.

D． Amphibians may eat plants that have been treated with pesticides.

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3 听录音，回答题
What's the average increase per year of foreign student population in the period between 1985 and 1990 in terms of percentage?

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