单项选择题

A．In 1939.
B．We don't know.
C．Only these years.
D．This year.

A.In
B.
B．We
C.
C．Only
D.
D．This
E.
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单项选择题
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
B.
B．Smoking
C.
C．We
D.
D．There
E.
单项选择题
A．It's useless.B．It's unnecessary.C．It's doubtful.D．It's helpful.
A.It's
B.
B．It's
C.
C．It's
D.
D．It's
E.
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