单项选择题

Science is the systematic______ of knowledge using nature itself or laboratory models and experiments.

A．acquisition
B．exploration
C．survey
D．pursuit
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单项选择题
The sailor replied in a tone as angrily as______, that he had lost his leg abroad in defence of those who did nothing at home.
A．they
B．them
C．their
D．theirs
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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