题目
下列物质中，属于含有共价键的离子化合物的是( ) A.MgCl2 B.Br2 C.KOH D.H2S 答案：解析：A项MgCl2是离子化合物，但其中不含共价键。B项中Br2只含共价键，且是单质。D项中H2S只含共价键，是共价化合物。C项中KOH是离子化合物，其中O原子与H原子之间以共价键结合，符合题意。答案：C
阅读理解
Recorded background music first found its way in factories, shops and restaurants in the USA．But it soon spread to other parts of the world．Now it is becoming increasingly difficult to go shopping or eat a meal without listening to music．
The best-known supplier of background music is an American company called “Muzak”．This word “Muzak” is now commonly used in English to refer to recorded music played continuously in restaurants, places of work, etc．The company has carried over a hundred studies which show that background music can create a pleasant atmosphere and improve productivity(生产效率)．It must be used in the right way, though．If the type of “Muzak” is wrong, it may well cause an entire factory to sleep!
(1)
Which of the following statements is true?
[ ]
A．
Background music is only used in the USA．
B．
Background music is used all over the world except the USA．
C．
Most shops and restaurants use background music now．
D．
It’s very difficult to listen to background music．
(2)
What’s “Muzak”?
[ ]
A．
It’s the name of an American company which sells recorded background music．
B．
It’s recorded music played continuously in shops, restaurants, places of work, etc．
C．
It’s the name of a composer of background music．
D．
Both A and B．
(3)
It has been proved that “Muzak” can _________．
[ ]
A．
improve productivity
B．
create a pleasant atmosphere
C．
cause an entire factory
D．
be all of the above
(4)
The studies of the American company show that _________．
[ ]
A．
the wrong kind of “Muzak” could be harmful
B．
“Muzak” is not good in factories
C．
“Muzak” is welcomed everywhere
D．
“Muzak” can cause sleepiness
(5)
The main idea of the passage is that _________．
[ ]
A．
background music is a good thing
B．
background music is a bad thing
C．
it’s important to use background music in the right way
D．
the Americans are good at using background music
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