单项选择题

When the person invited to a live TV program refuses to answer questions the on-air talk will be

A．at risk
B．in danger
C．at peril
D．on hazard
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单项选择题
This semester, the courses Williams has taken are History, Mathematics, Chemistry and Physics, Mathematics ______ the most important.
A．is
B．being
C．has been
D．of
单项选择题
Not all universities in the U.S. offer a full ______ of programs leading from a BA degree to postgraduate education through the doctorate.
A．variety
B．category
C．load
D．range
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