单项选择题

From the passage we can conclude that （）.

A．the main cause of lung cancer is second-hand smoke
B．most people know nothing about the danger of second-hand smoke
C．public places are dangerous for people to stay
D．children suffer most from second-hand smoke

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单项选择题

Now in the U. S. the women working outside home can get（）.

A．the same pay as those doing housework
B．as much as their husbands
C．an average payment of ＄ 11,600 a year
D．more and more money

单项选择题

Why are there laws made against smoking in public places in the U.S.？（）

A．Because people have realized the danger of second-hand smoke.
B．Because more and more people don't like smoking now.
C．Because parents don't want their children to become smokers.
D．Because the government wants to limit the production of cigarettes.