单项选择题

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 some pesticides get into ponds

A．They are applied to aquatic weeds by fish fanning.
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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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 some pesticides get into ponds

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 some pesticides get into ponds