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Questions 17 ～ 20 are based on the following talk. You now have 20 seconds to read Questions 17 ～ 20. 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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Questions 17 ～ 20 are based on the following talk. You now have 20 seconds to read Questions 17 ～ 20. According to the speaker, how do developers contribute to the reduction of amphibian population 您的浏览器不支持 audio 元素。