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

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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

单项选择题

We are sure that he will get over his illness．（）

A．certain
B．aware
C．happy
D．determined

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