单项选择题

If headaches only occur at night，lack of fresh air is often the cause（）

A．deliver
B．fall
C．happen
D．arrive

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单项选择题
A small number of firms have stopped trading（）

A．hotels
B．shops
C．restaurants
D．companies
单项选择题
A research center has been set up in this country（）

A．praised
B．established
C．reformed
D．criticized
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