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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