第2部分：阅读判断(第16——22题，每题1分，共7分)
下面的短文后列出了7个句子，请根据短文的内容对每个句子做出判断：如果该句提供的是正确信息，请选择A;如果该句提供的是错误信息，请选择B;如果该句的信息文中没有提及，请选择C。
Smoking
Since 1939, numerous studies have been conducted to determine whether smoking is a health hazard. The trend of the evidence has been consistent and indicates that there is a serious health risk. Research teams have conducted studies that show beyond all reasonable doubt that tobacco smoking is associated with a shortened life expectancy.
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 and is believed to be related to cancer of some other organs of the body. 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.
Apart from statistics, it might be helpful to look at what smoking tobacco does to the human body. Smoke is a mixture of gases, vaporized chemicals, minute particles of ash and other solids. There is also nicotine, which is powerful poison, and black tar. As smoke is breathed in, all those components form deposits on the membranes of the lungs. One point of concentration is where the air tube and bronchus divides. Most lung cancer begins at this point.
Filters and low tar tobacco are claimed to make smoking to some extent safer, but they can only slightly reduce, not eliminate the hazards.
16. It is easy to determine whether smoking is hazardous.
A. Right B. Wrong C. Not mentioned
17. Smoking reduces one’s life expectancy.
A. Right B. Wrong C. Not mentioned
18. Smoking may induce lung cancer.
A. Right B. Wrong C. Not mentioned
19. There is evidence that smoking is responsible for breast cancer.
A. Right B. Wrong C. Not mentioned
20. Male smokers have a lower death rate from heart disease than female smokers.
A. Right B. Wrong C. Not mentioned
21. Nicotine is poisonous.
A. Right B. Wrong C. Not mentioned
22. Filters and low tar tobacco make smoking safe.
A. Right B. Wrong C. Not mentioned