单项选择题

A．constitution
B．distribution
C．instruction
D．contribution
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单项选择题
A．observationB．informationC．behaviourD．appearance
A．observation
B．information
C．behaviour
D．appearance
单项选择题
What are experts trying to persuade people to do
A．To buy cigarettes with less tar.
B．To smoke only a few cigaretes a day.
C．To smoke only during a break.
D．To give up smoking entirely.
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