问题 单项选择题 A1型题

有关骨显像正常图像的描述,不正确的是()。

A.血池相骨影模糊

B.全身骨骼呈对称性的放射性分布

C.密质骨放射性分布高于疏质骨

D.松质骨血运丰富,能摄取较多的显像剂

E.耻骨联合有时受到膀胱放射性的干扰,显示不清

答案

参考答案:C

解析:血池相仍可见大血管影,软组织轮廓更为清晰,骨影模糊,放射性分布均匀;骨显像:全身骨骼呈对称性的放射性分布,但各部分骨骼由于结构不同、代谢活性程度及血运情况不一,放射性分布也不均匀。扁平骨如椎骨、肋骨、髂骨、颅骨板等以及长骨的骨骺端均含有大量代谢活跃、血运丰富的疏质骨,能摄取较多的显像剂,而长骨的骨干含密质骨较多,血运亦不丰富,摄取较少的显像剂,故前者较后者显像清晰。

单项选择题
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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