单项选择题

Most lecturers find it expedient to use notes when addressing to graduate students.

A．troublesome
B．expensive
C．useful
D．improper
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单项选择题
The president is often awakened by a noisy crowd which assembles on the White House.
A．concentrates
B．packs
C．squeezes
D．gathers
单项选择题
Author Leo once talked about his admiration for cooking expert Juli（）

A. esteem
B. opinion
C. regard
D. wishes
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