阅读理解。 What makes people happier:money or having happy friends and neighbors? Scientists have found an answer as part of a study. The new study found that friends of happy people had a greater chance of being happy themselves. And the smaller the distance between friends,the larger the effect they had on each other's happiness. For example,a person was 20% more likely to feel happy if a friend who lived within  l. 5 kilometers. Having a happy neighbor who lived next door increased the chance of being happy by 34%. The effects of friends' happiness lasted for up to a year. The scientists found that sadness also spread among friends,but not as much as happiness. People who take 3 degrees out of' separation still had an effect on a person's happiness.3 degrees of separation means the friend of a friend of a friend. The study showed that having an extra 5 ,000 dollars increased a person's chances of becoming happier by about 2 percent. But the researchers found that the influence of a friend of a friend of a friend can be greater than that. 1. The effects of happiness from friends ____. A. have a chance of 20%  to make you happy B. are usually within l.5km C. have a chance of 34% to make you happy D．can last about a year 2. The word 'spread' in the fourth paragraph means in China? A. 传播 B. 流行 C. 分享 D. 兴盛 3. Having a happy friend who lives within one and a half kilometers increases a chance of being happy by____. A. 45% B. 50％ C. 34％ D. 20％ 4. Which of the followings has the greatest effect on happiness according to the passage? A. Money. B. The friend of a friend. C. Happy friends who live in another city. D. Happy neighbors. 5. From this passage we know ____. A. who's the happiest B. what's happiness C. what makes people happier D. how to make people happy