【小题1】Doctors have discovered that (经常大笑的人长寿)。
【小题2】To some, happiness is being surrounded by family and friends. To others, (幸福意味着在某个方面取得成功)， such as meeting a goal.
【小题3】When I was a child, I could spend all day outside, (和自己的朋友在太阳底下玩。)
【小题4】 (了解文化差异)is a good way to understand more about each other.
【小题5】The picture of the young girl in the magazine (让我想起了我的表妹)。people/those who laugh a lot live longer.
网友回答
(答案→)people/those who laugh a lot live longer.
解析：
【小题1】考查定语从句：先行词是people/those， who引导定语从句在定语从句中做主语 laugh a lot live longer.
【小题2】考查词组：mean doing意味着做;;;happiness means achieving success in something,
【小题3】考查现在分词做伴随状语：playing in the sunshine with my friends.
【小题4】考查动名词做主语：Learning about cultural differences
【小题5】考查词组：remind sb of sth提醒某人某事：reminded me of my cousin./let me think of my cousin./made me think of my cousin