单项选择题

A．It was given in notes.
B．It was given verbally.
C．The topics of the assignment were written on the board.
D．The topics were printed on the handouts.
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单项选择题
A．A passenger;B．The dog.C．The truck-driver.D．A policeman.
A．A passenger;
B．The dog.
C．The truck-driver.
D．A policeman.
单项选择题
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.
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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