肺炎患儿并发呼吸衰竭时，应采取的措施为()A．严格记录出入量，限制钠盐的摄入 B．立

关于声现象，下列说法正确的是（　　）

A．声音可以在真空中传播

B．声音是由物体的振动产生的

C．声音的传播速度与介质和温度均无关

D．人们能辨别不同乐器发出的声音，是因为它们的响度不同

海冰对怎样影响海洋热状况？

公安机关的性质是公安机关职能的根据，而公安机关职能则从社会作用上反映了公安机关的性质。( )

B

For a song to become popular, people need to bear it.  In order for people　to hear it, the program directors at radio stations have to play it on the air. A song’s popularity is directly related to how often it is played. That is a big responsibility for program directors. How do they decide what gets played and what doesn’t?

In the past, disc jockeys(音乐节目主持人) decided what music was played on the radio. These DJs had an ear for music and an understanding of what their audience wanted to hear. Today, that is all changing. Most major radio stations are owned by a few large national businesses. The decision of what gets played on the radio is made by executives(主管) who have little or no interest in music. They do, however, know how to run a business, and they know what sells. So, the music industry designs and creates pop entertainers, and executives in the radio industry make sure that their music is played on the radio. This explains why you do not often hear anything new and fresh on the radio. The executives do not want to give air time to music that has not been tested on the market. It is too risky. They prefer to go with music that they already know will sell. They know it will sell because it sold last week and last month and last year. They just have to change it a little.

One of the most criticized(批评) practices in the music industry is the practice of “payola”. This is when record companies pay radio stations to play the music of a given artist. This practice makes many people lose trust in the music industry and is therefore against the law. A radio station can accept money in exchange for air time of a song, but they have to make it clear that the song is being played because its air time was paid for. They cannot present the song as if it were part of the normal play schedule(时刻表).

Payola affects both artists and audiences. The artists who work with small record companies that cannot pay a lot of money to radio stations have a much harder time getting exposure. It creates an unfair playing field. Music lovers suffer because they are not able to hear all the music that is available.

60. According to the passage, most major radio stations belong to       .

A. national businesses                      B. program directors   

C. pop entertainers                         D. record companies

61. “Payola” is the practice of        .

A. artists paying radio stations to play their songs

B. record companies buying air time for certain music

C. radio station paying record company for new songs

D. program directors deciding what music gets played

62. Who can make the largest profits from payola?

A. Disc Jockeys.                               B. The given artists.

C.  Business executives.                        D. Program directors.

63. It can be concluded from the passage that the author        .

A. has a positive attitude towards the practice of “payola”

B. is dissatisfied with the present situation in music industry

C. is calling for a change in the normal play schedule

D. thinks that the radio stations are doing the right thing

实用艺术主要包括（）等。

A.建筑艺术

B.园林艺术

C.影视艺术

D.工艺美术

E.现代设计