单项选择题

There are many things whose misuse is dangerous, but it is hard to think of anything that can be compared ______ tobacco products.

A．in
B．with
C．among
D．by
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单项选择题
The airplane arrived one hour behind ______.
A．timetable
B．plan
C．date
D．schedule
单项选择题
The last half of the nineteenth century ______ the steady improvement in the means of travel.
A．has witnessed
B．was witnessed
C．witnessed
D．is witnessed
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