Square dance is an American pastime． It started in America， during the California Gold Rush． Having been a popular folk tradition since 1651， it grew out of different kinds of traditional dances from around the world． 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．
In this dance eight people work as a team， called a square， to successfully complete a set of complex （复杂的） dance figures that are delivered by a caller， who calls out the movements． Four couples stand facing the center of the square， each couple standing on one side of the square， the man on the left and the woman on the right．
Large or small numbers of people can dance at one time． Sometimes 800 or 1， 000 people may dance at the same time． Or there may be only one square of eight people．
Costumes are worn by those people when they're dancing． This makes the dance more colorful to watch． Women often wear full skirts of different colors with a pretty blouse． Men may have colored shirts and western trousers， which they wear only when squaredancing． In some country areas， everyone wears his best clothes．
Square dance still exists today， ever since President Ronald Reagan signed an Act of congress in 1982 making square dancing the National Folk Dance of America． Many schools teach square dance in Physical Education， and there are square dance in Physical Education， and there are square dance competitions． In all parts of the United States you will find some schools， clubs， or other groups that are dancing the square dance for fun．



In the early times poeple danced ______ ．

A. after they did something special
B. when they were harvesting the crops
C. after they finished their work
D. when they were playing games

What's the exact meaning of the underlined word "costumes" in Paragraph 4？ ______

A. Special clothes people wear on some occasion．
B. Clothes people wear when working．
C. Something worn on the finger．
D. Something valuable like jewels．

What's the best title of the passage？ ______

A. Square Dancing in Ancient America．
B. Square Dancing in America．
C. A Special Party-Square Dancing．
D. Square Dancing Is Popular．