单项选择题

I was exhausted when I reached home, and I flung myself down on the front steps to__.

A．discover
B．recover
C．dissolve
D．retreat
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The __ school cannot give much practical training in living, because most of the students' time isspent in classes, studying lessons.
A． normal
B．ordinary
C．regular
D．commonly
单项选择题
The Chinese nation has __ significantly to the progress of human civilization.
A．related
B．contributed
C． owed
D．attached
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