单项选择题

Professor Smith and Professor Brown will ______ in presenting the series of lectures on American literature.

A. alter
B. alternate
C. substitute
D. exchange
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单项选择题
Televisions enable us to see things happen almost at the exact moment ______.
A. which they are happening
B. they are happening
C. which they happen
D. they have happened
单项选择题
The songs of Bob Dylan are very popular among people, who regard him ______ other musicians.
A. as more superior to
B. as superior than
C. as superior to
D. as more superior than
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