单项选择题

A small number of firms have ceased trading（）

A．completed
B．finished
C．fulfilled
D．stopped

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单项选择题
The ice is not thick enough to bear the weight of a tank．（）

A．suffer
B．accept
C．receive
D．support
单项选择题
If headaches only occur at night，lack of fresh air is often the cause．（）

A．start
B．begin
C．happen
D．visit
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