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severe
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A．Smoking can lengthen life expectancy.B．Smoking can shorten life expectancy.C．We haven’t found out yet.D．There is no connection between smoking and life expectancy.
A．Smoking can lengthen life expectancy.
B．Smoking can shorten life expectancy.
C．We haven’t found out yet.
D．There is no connection between smoking and life expectancy.
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___________________________ , we should try our best to overcome them. (不管我们碰到什么困难)
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