单项选择题

In the author's opinion, teachers can only be promoted depending on ______. ( )

A．how well they get along with the students
B．how well they give their lectures
C．how many papers and books they have published
D．how well they conduct their academic researches.

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单项选择题

According to the author, all the students know that ______. ( )

A．there are great differences among the lecturers as to their quality of teaching
B．quite a lot of teachers can produce the results students desire
C．they must be inspired to learn
D．it is too dull to attend lectures

单项选择题

Sign language is said to be very vivid and exact and can be used internationally except for ( )

A．spelling
B．ideas
C．whole words
D．expressions