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 _________.

　　試題詳解

　　本文是一篇說明性的文章，從7個(gè)方面探討了導(dǎo)致肥胖的原因，例如壽沒有充足的睡眠、年齡的增長、基因的影響等。

　　1. C

　　本題考查文章中心，為主旨題�？焖匍喿x的結(jié)構(gòu)明確，先提出文章主要話題，然后以標(biāo)題的形式展開。因此文章的主旨就在文章前兩段。文章第一段提出談?wù)撛掝}：肥胖，緊接著第二段提出科學(xué)家目前提出了關(guān)于肥胖的七個(gè)主要原因。