单项选择题

Passage one Questions 26 to 28 are based on the passage you have just heard.

A．Because they pollute air.
B．Because they are natural hazards.
C．Because they are increasing in numbers.
D．Because people don’t walk so often.
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单项选择题
A．They need to make more efforts.B．They’ll have more work to do tomorrow.C．The others have done the greater part of it.D．They’ve finished more than half of it.
A．They need to make more efforts.
B．They’ll have more work to do tomorrow.
C．The others have done the greater part of it.
D．They’ve finished more than half of it.
单项选择题
A．Summer.B．Winter.C．Fall.D．Spring.
A．Summer.
B．Winter.
C．Fall.
D．Spring.
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