题目内容：

    Street dances are dance styles that evolved (演变)outside of dance studios in any available open space.They are often improvisational (即兴的）and social in nature, encouraging interaction and contact with audiences and the other dancers.These dances generally evolve out of urban and suburban spaces and are a part of the native culture of that geographical area.Some examples of street dances include b-boying, or breakdancing, which originated in New York City.

Street dances are dances that evolve between people in a social environment, although it cannot be always determined as to how they actually do evolve between people.In theory, as one person comes up with a move that looks good to another person, the other person tries to copy that move.Similar to the game of Chinese whispers, the effect is that the other person cannot absolutely perform that move the same way as the other person, thus leading to the dancers creating their own style or entirely new moves.

There is a small difference between entirely freestyle dance and an absolute street dance.While freestyle dance is random and a personal dance invented by a single person (even if it’s based on someone else’s dance style) , a full street dance is a collection of the various similar dance moves and styles collected into one practice and regarded as the same dance.For example, when b-boying evolved out of the early hip-hop culture, people came up with their own moves，and other people improved them.Street dances constantly evolve for as long as they are now and then practiced and regarded as the same dance.All the moves danced to breaks in hip-hop culture were regarded as b-boying.

Sometimes it is possible to trace back street dance styles that were mostly pioneered by specific (具体的）people.One example is locking, which is often regarded as being started by Don Campbell, who was a 1970s pioneer of American street dance.Most of the time it is impossible to owe street dances to specific people, since the dances evolve outside of professional dance environments, and there is no social or legal record.Street dance pioneers also rarely have professional degrees in dance, thus distinguishing street dances from other modern dance forms.

1.Paragraph 1 is intended to tell us the _________of street dances.

A. varieties B. changes

C. characteristics D. distributions

2.What do we know about street dances?

A. Dancers perform them in dance studios.

B. They are developed by professional dancers.

C. They are collected from different moves and styles.

D. Dancers create moves based on other people’s moves.

3.Chinese Whispers are mentioned in Paragraph 2 to_________.

A. stress a street dancer's own style

B. show the effect of Chinese Whispers

C. introduce a popular Chinese game

D. explain the characteristics of street dances

4.The passage is probably taken from__________.

A. a travel journal

B. a history textbook

C. a popular magazine

D. a museum brochure