Michael Symonds at the university of Nottingham,UK,found that first-bron children have more fat than younger ones. As family size decreases, firstbrons account for a greather share of the population. In 1964, british women gave birth to an average of 2.95 children;by 2005 that figure had fallen to 1.79. in the US in 1976, 9.6% of woman in their 40s had only one chile;in 2004 it was 17.4%. this combination of older mothers and more single children could be contributing to the obesity epidemic.

　　7.Like marrying like

　　Just as people pair off according to looks, so they do for size. Lean people are more likely to marry lean an d fat more likely to marry fat. On its own, like marrying like cannot account for any increase in obesity. But combined with others- particularly the fact that obesity is partly genetic, and that heavier people have more children-it amplifies the increase form other causes.

　　1. What is the passage mainly about?

　　A）effects of obesity on peoples health

　　B）the link between lifestyle an obesity

　　C）New explanations for the obesity epidemic

　　D）possible ways to combat the obesity epidemic

　　2. In the US Nurse Health Study, women who slept an average of 7 hour a night ____

　　A）gained the least weight

　　B）were inclined to eat less

　　C）found their vigor enhanced

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