单项选择题

According to the passage, where did diamonds first come into existence

A．In the volcanoes.
B．On the floor of the sea.
C．Under the river bed.
D．At the foot of the mountains.
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单项选择题
People decide to go on the wagon because ______.
A．they enjoy having one drink after another
B．they like the kind of drinks they get on the wagon
C．they are afraid of losing their self-control in drinking again
D．they are alcoholics and can not control themselves well
单项选择题
Americans are now taking steps to solve the problem of alcoholism by ______.
A．decreasing the amount of alcohol dnmk by drivers
B．teaching young students how to drive safely after drinking alcohol
C．punishing people more heavily for driving after drinking alcohol
D．giving special courses to teach doctors about new drugs and treatments for alcoholics
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