D)it results from lack of sleep
4. A)it makes us stay indoors more
B)it accelerates our metabolic rate
C)it makes us feel more energetic
D)it contributes to our weight gain
5. A)it threatens their health
B)it heightens their spirits
C)it suppresses their appetite
D)it slows down their metabolism
6. A)heavy smokers
B)passive smokers
C)those who never smoke
D)those who quit smoking
7. 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 not entirely clear
9.According to Michael Symonds, one factor contributing to the obesity epidemic is decrease of family size
10 when two heavy people get married, chances of their children getting fat increase, because obesity is party genetiz
