单项选择题

In case of poisoning, immediately give large quantities of soapy or salty water in order to ______ vomitting.

A．control
B．clean
C．induce
D．stop
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单项选择题
Smoking is ______ in many university classrooms in the United States.
A．permitted
B．taught
C．prohibited
D．revoked
单项选择题
______ , he would have been able to pass the exam.
A．If he studied more
B．If he were studying to a great degree.
C．Studying more
D．Had he studied more
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