单项选择题

A．Get the results of the survey back.
B．Draw the results of the survey.
C．Make some conclusions.
D．Collect more information
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单项选择题
A．Poor visibility.B．Slippery conditions caused by the rain.C．Both A andB.D．The narrow national highway.
A．Poor visibility.
B．Slippery conditions caused by the rain.
C．Both A andB.
D．The narrow national highway.
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