单项选择题

According to the passage, lung cancer ______.

A．is the major cause of death between the ages of 35 and 55
B．is most often caused by smoking
C．never affects non—smokers
D．has nothing to do with smoking

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单项选择题

Women who smoke during pregnancy produce ______.

A．lighter babies than those who don't
B．heavier babies than those who don't
C．babies who can't live long
D．babies who suffer from heart diseases

单项选择题

What is the main idea of the passage

A．Man—smokers live shorter than woman—smokers.
B．All the deaths in Britain result directly from tobacco smoking.
C．Smoking is the main killer of babies.
D．Smoking can give rise to several major diseases.