A) one without which it is impossible for the effect to occur
B) one of the causes that can produce the effect
C) one that is enough to make the effect occur
D) none of them
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
5. This passage mainly discusses ____.
A) causal reasoning B) classification of cause
C) various types of reasoning D) the causal process
Questions 1 to 5 are based on the following passage.
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, 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 in rivers and the sea, of staying up late on the night before an
examination?
注:1.reasoning 推理
2.第一句 Another...下结论,是主题句
3.第二、三句 We want to ...an examination?是举例,可以略读
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