单项选择题

It is true that road travel in the old days was difficult,______ and uncomfortable, but it was comparatively safe.

A．tedious
B．irritable
C．worrying
D．disinteresting
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单项选择题
Now there are sophisticated tests which can______ poisons in the tiniest amount not even enough to kill a mouse.
A．discern
B．ascertain
C．detect
D．locate
单项选择题
______the giant panda belonged to the bear______ raccoon families was a matter of zoological contention for many years.
A．Whether...or
B．That...and
C．As...and
D．That...or
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