单项选择题

Since 1939, numerous scientific studies ______.

A．proved smoking causes fatal diseases
B．proved smoking causes life-shorting diseases
C．proved smoking is a health risk
D．had been made to prove whether smoking causes life shorting

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热门试题

单项选择题

According to 1970 figures in the U.S. men smokers are ______.

A．twice as many as women smokers
B．two times as many as women smokers
C．1.5 times as many as women smokers
D．seventeen percent less than women smokers

单项选择题

What’s cliche

A．Briefly expressed general truth.
B．Idea or expression that has been too much used and is now out-dated.
C．Popular short saying with words of advice..
D．A group of words whose meaning cannot be predicted from the constituent words.