5. What does the author say about the effect of nicotine on smokers?
A) It threatens their health
B) It heightens their spirits
C) It suppresses their appetite
D) It slows down their metabolism
6. Who are most likely to be overweight according to Katherine Flegal’s study?
A) heavy smokers
B) passive smokers
C) those who never smoke
D) those who quit smoking
7. According to the US National Center for Health Statistics, the increased obesity in the US is the result of ________.
A) the growing number of smokers among young people
B) the rising proportion of minorities in its population
C) the increasing consumption of high-calorie foods
D) the improving living standards of the poor people
8. According to the US National Heart, Lung and Blood Institute, the reason why older mothers’ children tend to be obese remains ____________.
9. According to Michael Symonds, one factor contributing to the obesity epidemic is decrease of __________.
10. When two heavy people get married, chances of their children getting fat increase, because obesity is _________.
试题详解
本文是一篇说明性的文章，从7个方面探讨了导致肥胖的原因，例如寿没有充足的睡眠、年龄的增长、基因的影响等。
1. C
本题考查文章中心，为主旨题。快速阅读的结构明确，先提出文章主要话题，然后以标题的形式展开。因此文章的主旨就在文章前两段。文章第一段提出谈论话题：肥胖，紧接着第二段提出科学家目前提出了关于肥胖的七个主要原因。
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