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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, 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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单项选择题

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.

Questions 17 ～ 20 are based on the following talk. You now have 20 seconds to read Questions 17 ～ 20. According to the speaker, why do pesticides pose a threat to amphibians 您的浏览器不支持 audio 元素。

Questions 17 ～ 20 are based on the following talk. You now have 20 seconds to read Questions 17 ～ 20. According to the speaker, why do pesticides pose a threat to amphibians