问题 单项选择题

检验结果发现,吸烟愈多体力下降愈明显。钙与锌离子浓度也随吸烟量的增加而下降。专家们推测,这可能是由于体内烟碱浓度增加使某些运动神经元受到抑制,从而使骨髓肌兴奋性降低的缘故。 这段话主要支持了这样一个论点,即( )。

A.吸烟使人体力下降

B.烟碱浓度增加,运动神经元也相应增加 .

C.钙与锌离子浓度的增加使骨髓肌兴奋性降低

D.吸烟导致体内烟碱浓度增加从而使骨髓肌兴奋性降低

答案

参考答案:D

解析: 作者在文中提到,吸烟者体内钙锌离子浓度的下降原因,可能是由于体内烟碱浓度增加使某些运动神经元受到抑制,从而使骨髓肌兴奋性降低。据此可知,作者支持的观点是,吸烟导致体内烟碱浓度增加,从而导致骨髓肌兴奋性降低。故选D。

阅读理解

Muzak

The next time you go into a bank, a store, or a supermarket, stop and listen. What do you hear?     ____67    It’s similar to the music you listen to, but it’s not exactly the same. That’s because this music was especially designed to relax you, or to give you extra energy. Sometimes you don’t even realize the music is playing, but you react to the music anyway.  

Quiet background music used to be called “elevator (电梯) music” because we often heard it in elevators. But lately we hear it in more and more places, and it has an new name “Muzak”. About one-third of the people in America listen to “Muzak” every day. The music plays for 15 minutes at a time, with short pauses in between. It is always more lively between ten and eleven in the morning, and between three and four in the afternoon, when people are more tired.     68    

If you listen to Muzak carefully, you will probably recognize the names of many of the songs. Some musicians or songwriters don’t want their songs to be used as Muzak, but others are happy when their songs are chosen. Why?     69   

Music is often played in public places because it is designed to make people feel less lonely when they are in an airport or a hotel. It has been proven that Muzak does what it is designed to do. Tired office workers suddenly have more energy when they hear the pleasant sound of Muzak in the background.     ____70    Supermarket shoppers buy 38 percent more groceries.

    71    They say it’s boring to hear the same songs all the time. But other people enjoy hearing Muzak in public places. They say it helps them relax and feel calm. One way or another, Muzak affects everyone. Some farmers even say their cows give more milk when they hear Muzak!

A.Some people don’t like Muzak.

B.The music gives them extra energy.

C.Music is playing in the background.

D.Factory workers produce 13 percent more.E. Muzak tends to help people understand music better

F. They get as much as $4 million a year if their songs are used.

G. Muzak is played in most of the big supermarkets in the world.

多项选择题