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Another common type of reasoning is the search for causes and results. We wa
Another common type of reasoning is the search for causes and results. We wa
游客
2024-02-27
8
管理
问题
Another common type of reasoning is the search for causes and results. We want to know whether cigarettes really do cause lung cancer, what causes 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 (硫)or lead in the atmosphere, of oil spills, and raw sewage in rivers and the sea, of staying up late on the night before an examination.
Causal reasoning may go from cause to effect or from effect to cause. Either way, we reason from what we know to what we want to find out. Sometimes we reason from an effect to a cause and then on to another effect. Thus, if we reason that because the lights have gone out, the refrigerator won’t work, we first relate the effect (light out) to the cause (power off) and then relate that cause to another effect (refrigerator not working). This kind of reasoning is called, for short, effect to effect. It is quite common to reason through an extensive chain of causal relations. When the lights go out, we might reason in the following causal chain: lights out--power off--refrigerator not working -- temperature will rise -- milk will sour. In the other words, we diagnose a succession of effects from the power failure, each becoming the cause of the next.
Causes are classified as necessary, sufficient, or contributory. 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, though there may be more than one sufficient cause: a dead battery is enough to keep a ear from starting, but faulty spark plugs or an empty gas tank will have the same effect. A contributory cause is one which helps to produce an effect but can’t do so by itself, as running through a red light may help cause an accident, though other factors -- pedestrians or other cars in the intersection -- must also be present.
In establishing or denying a causal relation, it is usually necessary to show the process by which the supposed cause produces the effect. Such an explanation is called a causal process. [br] Your refrigerator is not working and you have found that the electric power had been cut off. The power failure is a _____.
选项
A、necessary cause
B、sufficient cause
C、contributory cause
D、none of the above
答案
B
解析
推理题。通过第三段第三句对sufficient cause的解释可以推断出本题所举例子属于 sufficient cause的范畴。
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