单项选择题

Many medical doctors point out that the widespread of cigarette smoking______ the increase of deaths.

A．attributes to
B．confines to
C．contributes to
D．restricts to
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Do you want to fly first or______ class
A．savings
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C．economy
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单项选择题
The whole family has______ a period of considerable hardship and unhappiness.
A．undertaken
B．underlined
C．undone
D．undergone
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