单项选择题

Professor Johnson is said to have made some ________ advance in his research in the past year.

A．extensive
B．significant
C．fundamental
D．dominant
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单项选择题
The widespread rumor was probably ________ by one of the president's aides.
A．launched
B．stemmed
C．manufactured
D．abstracted
单项选择题
Sometimes the student may be asked to write about his ________ to a certain book or article that has some bearing on the subject being studied.
A．comment
B．comprehension
C．impression
D．reaction
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