单项选择题

The students, ______ reading their books, did not observe me enter the classroom.

A．deficient in
B．adequate for
C．short of
D．intent on
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单项选择题
The Chinese diplomatic envoys were sent who should strengthen our international position and strive for world peace and friendly ______ among peoples.
A．collaboration
B．harmony
C．coordination
D．intercourse
单项选择题
It is clear that lack of education will greatly ______ the laid-off workers from getting a job again.
A．hamper
B．confuse
C．perplex
D．reverse
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