大学英语四级考试阅读笔记(21)
D) none of them
注：第三段，A选项是必须在场的相同意思的改写。B选项是原因之一，sufficient cause，C选项没有"必须"含义。
Causes are classified as necessary, sufficient, or contributory（起辅助作用的）. A necessary cause is one which must be present for the effect to occur, as combustion (燃烧)，is necessary to drive a gasoline engine. A sufficient cause is one which can produce an effect unaided (独自的), though there may be more than one sufficient cause: a dead battery is enough to keep a car from starting, but faulty spark plugs（火花塞）or an empty gas tank will have the same effect. A contributory cause is one which helps to produce an effect but cannot do so by itself, as running through a red light may help cause an accident, though other factors --- pedestrians (行人) or other cars in the intersection-must also be present.
4. Your refrigerator is not working and you have found that the electric power has been cut off.
The power failure is a ____.
A) necessary cause B) sufficient cause
C) contributory cause D) none of them
注：断电不是冰箱不工作的必要原因，而是原因之一，冰箱坏了也可以导致冰箱不工作。
Causes are classified as necessary, sufficient, or contributory（起辅助作用的）. A necessary cause is one which must be present for the effect to occur, as combustion (燃烧)，is necessary to drive a gasoline engine. A sufficient cause is one which can produce an effect unaided (独自的), though there may be more than one sufficient cause: a dead battery is enough to keep a car from starting, but faulty spark plugs（火花塞）or an empty gas tank will have the same effect. A contributory cause is one which helps to produce an effect but cannot do so by itself, as running through a red light may help cause an accident, though other factors --- pedestrians (行人) or other cars in the intersection-must also be present.
5. This passage mainly discusses ____.
A) causal reasoning B) classification of cause
C) various types of reasoning
D) the causal process
注：主题题。文中只提到因果关系推理的几种操作方法
Another common type of reasoning is the search for causes and results. We want to know whether cigarettes really do cause lung cancer, what cause malnutrition（营养不良）, the decay of cities, or the decay of teeth. We are equally interested in effects: what is the effect of sulphur or lead in the atmosphere, of oil spills and raw sewage (污水、污物）in rivers and the sea, of staying up late on the night before an examination?
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Questions 6 to 10 are based on the following passage:
6. The author's purpose writing this passage is to tell ____.
A) readers how to be popular in with around
B) teen-agers how to learn to decide things for themselves
C) parents how to control and guide their children
D) people how to understand and respect each other
7. According to the author, many teen-agers think they are brave enough to act on their own, but, in fact, most of them ____.
A) have much difficulty understanding each other
B) lack confidence
C) dare not cope with problems single-handed
D) are very much afraid of getting lost
8. Which of the following is NOT true according to the passage?
A) There is no popularity that really counts.
B) What many parents are doing is in fact hindering their children from finding their own paths.
C) It is not necessarily bad for a teen-ager to disagree with his or her classmates.
D) Most teen-agers claim that they want to do what they like to, but they are actually doing the same.
9. The author thinks of advertisements as ____.
A) convincing B) influential
C) instructive D) authoritative
10. During the teen-age years, one should learn to ____.
A) differ from others in as many ways as possible
B) get into the right season and become popular
C) find one's real self
D) rebel against parents and the popularity waves
I hear many parents complaining that their teen-age children are rebelling, I wish it were so. At your age you ought to be growing away from your parents. You should be learning to stand on your own two feet. But take a good look at the present rebellion. It seems that teenagers are all taking the same way of showing that they disagree with their parents. Instead of striking out boldly on their own, most of them are clutching at（attempting to seize） one another's hands for reassurance.
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