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  3. Smoking Since 1939, numerous studies have been conducted to determine whether smoking is a health hazard. The trend of the ev

Smoking Since 1939, numerous studies have been conducted to determine whether smoking is a health hazard. The trend of the ev

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问题                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 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 from 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.
选项 A、Right
B、Wrong
C、Not mentioned
答案B
解析 该题考察考生的推断或总结概括能力。利用hazardous(问题句中的修饰词)作为答案线索词，这样找到答案相关句：Since 1939,numerous studies have been conducted to determine whether smoking is a health hazard．(hazardous的名词形式)该句说“自从1939年以来，已经进行了许多次实验以确定吸烟是否会对健康造成危害。”因此可以推断出  “确定吸烟是否有害”并不容易。
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