单项选择题

A．A man.
B．A woman.
C．A man and a woman.
D．Two men.
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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.
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.
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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