In the United States the most popular form of folk dancing has been square—dancing since the earlier days．In those days，men and women worked in groups to build a house or harvest crops．When the work was done，they usually danced merrily and happily in a store or in a farm kitchen．
Nowadays square-dancing is still performed．A square，which has four sides，is formed by four couples．Each couple stands on one side of the square，the man on the left and the woman on the right．That is to say, one square has eight people and they stand facing the center of the square．
Large or small numbers of people can dance together．Sometimes as many as 800 or 1,000 people may be dancing all at the same time．
Costumes are worn by those who do the square—dancing．This makes the dancing more colorful to watch．Men may have colored shirts and western trousers they wear only on special days．Women often wear full skirts of different colors with a pretty blouse．In some country areas，everyone wears their best clothes．
Today in all parts of the US you will find some schools，clubs，or other groups that are square-dancing for fun．They enjoy it very much．
小题1: In the earlier days，when did people do square—dancing?(No more than 6 words)
小题2: How many people are square—dancing if there is one square?(No more than l word)
小题3: What does the underlined word“costumes’’mean in Paragraph 4?(No more than 8 words)
小题4: What do people in some country areas wear in square-dancing?(No more than 6 words)
小题5: How do people of the US like square-dancing today?(No more than 6 words)
小题1:When the work was done. / After they finished their work.
小题2:8/Eight.
小题3:Colorful clothes worn on special days.
小题4:They wear their best clothes.
小题5:They enjoy it very much.
题目分析：广场舞（方形舞）不仅很受欢迎，很早以前人们也聚在一起庆祝一座房子建成或收获庄稼。跳跳广场舞至少需要8个人组成4对。他们都面对着方形广场的中心。每一对站在广场的一边，男左女右。有时多达 800 或 1000 人都在同时跳。人们穿上节日盛装来跳舞。
小题1:细节理解题。根据“When the work was done，they usually danced merrily and happily in a store or in a farm kitchen．”可知人们聚在一起跳广场舞是在工作完成之后。故回答When the work was done. / After they finished their work.。
小题2:细节理解题。根据“That is to say, one square has eight people and they stand facing the center of the square．”可知如果是方形，需要八个人。故回答8/Eight.。
小题3:细节理解题。根据倒数第二段的意思可知人们跳舞时都会穿上在特殊的节日才会穿的漂亮衣服。故回答Colorful clothes worn on special days.。
小题4:细节理解题。根据“In some country areas，everyone wears their best clothes．”可知，在一些农村地区，每个人都会穿上最好的衣服。故回答They wear their best clothes.
小题5:细节理解题。根据最后一段，尤其是“They enjoy it very much．” 可知现在美国人很喜欢广场舞。故选D。