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.
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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.
单项选择题
A．It smashed into a row of houses.B．It was run over by a truck.C．It was too nervous to leave the strip in the middle of the road.D．It hit a truck.
A．It smashed into a row of houses.
B．It was run over by a truck.
C．It was too nervous to leave the strip in the middle of the road.
D．It hit a truck.
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