It isn’t entirely clear why friendship has such a big effect. It may be because people with strong social ties also have better access to health services and care. Beyond that, however, friendship clearly has a profound psychological effect. People with strong friendships are less likely than others to get colds, perhaps because they have lower stress levels.

　　Last year, researchers studied 34 students at the University of Virginia, taking them to the base of a steep hill and fitting them with a weighted backpack. They were then asked to estimate the steepness of the hill. Some participants stood next to friends during the exercise, while others were alone.

　　The students who stood with friends gave lower estimates of the steepness of the hill. And the longer the friends had known each other, the less steep the hill appeared.

　　“People with stronger friendship networks feel like there is someone they can turn to, ”said Karen A. Roberto, director of the center for gerontology(老年医学)at Virginia Tech. “Friendship is an undervalued resource. The consistent message of these studies is that friends make your life better. ”

　　【文章大意】如何保持身心健康? 相信每个人对此都很感兴趣并能给出自己的答案。本文作者向我们介绍了一个有利于身心健康的, 很重要又长期被人们忽视的因素——友谊。

　　1. What’s the main idea of the passage?

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