单项选择题
The capital of Canada is ______.
A．Vancouver
B．Ottawa
C．Toronto
D．Quebec
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单项选择题
According to the article, why should building joints be agile
A．Such joints are cheap.
B．Such joints make buildings flexible and moveable.
C．Such joints are concrete frames.
D．Such joints make the buildings rigid.
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填空题
What was Susan’s motive for carrying on the project
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