The study found that the sex of the friends was also an influence. In same-sex friendships a person had a 70% increased risk of becoming obese.Men had a 44% increased risk of becoming obese after weight gain in brother. In sisters, it was 67%.

　　The researchers also considered the effect of where people lived in relation to each other. James Fowler of the University of California, San Diego, was the other lead investigator. He says a friend who lives a few hundred kilometers away has as much influence as one in the same neighborhood. He says the study demonstrates the need to consider that a major part of people’s health is tied to their social connections.

　　Both investigators say their research shows that obesity is not just a private medical issue, but a public health problem.

　　1. What does the underlined sentence in Para. 2 mean?

　　A. Obesity has a negative influence on a close friend.

　　B. Friends might also play a part in losing weight.

　　C. One might have a positive influence on one’s friend.

　　D. Friends usually don’t follow each other to lose weight.

　　2. Who is mostly likely to gain weight?

　　A. A man who has a fat brotherB. A husband who has a fat wife

　　C. A wife who has a fat husbandD. A woman who has a fat female friend

　　3. Which of the following statements doesn’t the passage agree with?

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