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 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
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