单项选择题

The doctor explained to the students the hazards of radiation upon human beings.

A．dangers
B．endeavours
C．bachelors
D．benefits
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单项选择题
The very north and south regions are covered with ice and snow.
A．areas
B．rocks
C．mountains
D．districts
单项选择题
Argument among the speakers at the conference is bordering on violence.
A．is close to
B．is beside
C．is next to
D．is alongside
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