单项选择题

People in the third world countries are now facing a serious problem that ______.

A．infectious diseases are becoming big killers
B．more people are becoming the victim of cancer
C．smallpox and typhoid are spreading widely
D．some middle- and old-aged people are getting sick easily
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单项选择题
The poor and the rich usually develop different patterns of cancers because ______.
A．most of the rich people are living in industrialized countries
B．the poor people smoke more heavily than the rich
C．the two have different living conditions
D．the two have different attitudes toward life
单项选择题
From the last paragraph we can come to know that ______.
A．The best cure for some cancers is by early detection
B．a worldwide campaign against smoking has yielded a good result
C．cigarette manufacturers are expanding their market in western countries
D．most governments in the world are backing up the anti-smoking campaign
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