4．Some dances gain more popularity than others because they can be performed to different kinds of music and the steps change accordingly．One such dance is waltz（华尔兹）．
There is a basic form for waltz，which you can see in this drawing of a dancing couple．The man places one arm around the woman's waist and she places her opposite hand on his shoulder．Then，they stretch their other arms out from their bodies and clasp hand．If someone tries to teach you a formal kind of dancing，chances are your teacher will start with the waltz．Have you ever tried to dance like this？
There are lots of different kinds of waltz，all performed to different types of waltz music．The music might be fast or slow but what they all have is a regular one-two-three，one-two-three rhythm．
The traditional form is the old-school waltz in which dancers turn all the time with a hopping（跳跃），springy step．This waltz has a slow，smooth，gliding step．There's also the Mexican waltz，which moves much faster．Listen to this Mexican waltz music and you can imagine how fast the dancers had to move．
Formal dancing has even become a profession，with people entering competitions．Have you ever seen a formal dance competition？
Today，ballroom dancing is almost considered a competitive sport； professionals perform different dances，each with strict rules．Everything from where the dancers place their hands to how they move is judged．In the glide waltz，dancers are judged by how smoothly they move．"I can dance with a glass of water on my head，"is a well known sentence used by skilled dancers in the old days．In the past，some people learned how to dance by reading books，while others studied with a teacher called the"dancing master．"How do people learn to dance today？
51．When a couple are dancing，C．
A．the girl places one arm around the man's waist
B．the man puts one hand on the girl's shoulder
C．they stand face to face with one of their hands held together
D．the man puts one arm around the girl's waist and the other on her shoulder
52．Why do the dancers move fast in the Mexican waltz？A
A．To keep up with the music．
B．To show how well they perform．
C．To catch up with the other dancers．
D．to show the difference of the dance．
53．What do the different types of waltz have in common？D
A．They use the same kind of music．
B．They share the same kind of steps．
C．Their speeds are the same．
D．They have the same kind of rhythm．
54．If one says"I can dance with a glass of water on my head，"we know thatA．
A．he is a good dancer
B．he is a beginner
C．he is practising dancing
D．he is tired of dancing
55．What is the author's purpose in writing the passage？C
A．To tell us to learn waltz
B．To tell us how to dance．
C．To tell us something about waltz
D．To tell us the development of waltz．
分析 本文主要讲解了华尔兹这种优美的舞蹈，不同类型的华尔兹，向我们展示了这种舞蹈的魅力．
解答 51．C 细节理解题．根据文章第二段的内容The man places one arm around the woman's waist and she places her opposite hand on his shoulder．Then，they stretch their other arms out from their bodies and clasp hand．当一对搭档跳华尔兹的时候，他们的动作应该如上文所阐述的，结合选项就应该与C搭配，故选C．
52．A 细节理解题，根据文章第三段There are lots of different kinds of waltz，all performed to different types of waltz music．以及第四段There's also the Mexican waltz，which moves much faster．Listen to this Mexican waltz music and you can imagine how fast the dancers had to move．可知，舞步的快慢是由音乐的节奏来决定的，故答案选A．
53．D 细节理解题，根据The music might be fast or slow but what they all have is a regular one-two-three，one-two-three rhythm．不同类型的华尔兹音乐的节奏都是相似的，故答案选D．
54．A 细节理解题，根据以下内容．"I can dance with a glass of water on my head，"is a well known sentence used by skilled dancers in the old days 说明一个好的舞者skilled dancer 才有能力头顶一碗水的跳舞，再结合选项，故答案为A．
55．C 推理判断题，根据文章内容，作者给我们对华尔兹这种舞蹈进行了讲解，以及不同类型的华尔兹，结合选项，可知作者意为向我们介绍它，故答案为C．
点评 本文是一篇历史文化类阅读理解，题目涉及多道细节理解题，做题时结合原文和题目有针对性的找出相关语句进行仔细分析，结合选项选出正确答案．推理判断题也是要在抓住关键句子的基础上合理的分析才能得出正确答案，切忌胡乱猜测，一定要做到有理有据．
