题目内容
阅读理解。阅读下列短文，从每题所给的选项中，选出最佳答案。
Since 1939, scientists have done lots of experiments and studies to determine whether smoking is harmful to one's health. The results have been showing that there is a serious health risk. Research teams have made studies that shows that smoking, particularly cigarette smoking has something to do with a shortened life.
Cigarette smoking is believed by most research workers in this field to be an important factor in the development of cancer of the lungs and cancer of the throat. Male cigarette smokers have a higher death rate from heart disease than non-smoking males. (Female smokers are thought to be less affected because they do not breathe in the smoke so deeply. )
So give up smoking. If you don't smoke-don't start!
1．This passage mainly tells us ________.
[ ]
A．smoking is less dangerous to men
B．the results of the studies on smoking
C．how dangerous smoking is
D．both B and C
2．From the passage we know ________.
[ ]
A．tobacco smoking is much more dangerous than cigarette smoking
B．smoking is a good habit to some men
C．smoking can cause heart trouble to male smokers only
D．smoking certainly has something to do with some kinds of cancer
3．From the passage we know the writer is ________.
[ ]
4．Which is NOT true from the passage?
[ ]
A．Scientists have been studying smoking since people began to smoke.
B．Smoking can cause health risk to people, both smokers and non-smokers.
C．Generally speaking, non-smokers live longer than those who smoke.
D．If you smoke, give it up!
5．If you are a smoker and cannot give it up so soon, it would be better ________.
[ ]
A．not smoke so deeply
C．to see the doctor once a week
B．to use a pipe
D．to smoke only a packet a day
