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
______ in this way, the situation doesn't seem so disappointing.
A．To look at
B．Looking at
C．Looked at
D．To be looked at
单项选择题
I hope all the precautions against air pollution, ______ suggested by the local government, will be seriously considered here.
A．while
B．since
C．after
D．as
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