单项选择题

It was()great shock to the world that two airplanes crashed into() World Trade Center in New York on September 11, 2001.

A．a; /
B．the; the
C．a; the
D．/; the

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单项选择题

Radio Star,()by the English Department, is very popular with the students.

A．built
B．founded
C．kept
D．found

单项选择题

He said that books on()popular science are in()short supply.

A．the; a
B．/; /
C．/; the
D．the; the

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