单项选择题


Questions 17～20 are based on the following talk.
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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单项选择题
Who benefits most from inflation
A．Persons who have salaries according to long-term contracts.
B．Persons who own businesses.
C．Persons with old-age pensions.
D．Persons with slow-rising incomes.
单项选择题
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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