单项选择题

Questions 17～20 are based on the following talk. You now have 20 seconds to read Questions 17～20.
What does the speaker mainly discuss

A．The distribution of different species of amphibians.
B．Possible reasons for reduction in the number of amphibians.
C．The effects of environmental change on the fish industry.
D．Guidelines for the responsible use of pesticides.

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Questions 17～20 are based on the following talk. You now have 20 seconds to read Questions 17～20. What does the speaker mainly discuss

Questions 17～20 are based on the following talk. You now have 20 seconds to read Questions 17～20.
What does the speaker mainly discuss