题目

So you're between the ages of 13 and 24. What makes you happy? Spending time with family was the top answer to that open-ended question, according to an extensive survey--more than 100 questions asked of 1,280 people aged 13-24 -- conducted by The Associated Press on the nature of happiness among America's young people. Next was spending time with friends. And good news for parents: Nearly three quarters of young people say their relationship __________ makes them happy. They're my foundation, says Kristiana St. John, 17, a high-school student from Queens in New York. My mom tells me that ev宋元是我国古代科技发展的商峰时期，下列科技成就生北宋时期取得的是A. 活字印刷术的发明B. 《齐民要术》的问世C. 火药开始用于军事D. 指南针外传到欧洲