29. Scientists have discovered that what prevents people from concentrating on something is

　 A. all kinds of noise　　　　　　　　　 　 B. great changes in the level of noise

　 C. background noise　　　　　　　　　　 D. popular music

三

Have you ever been in a meeting while someone was making a speech and realized suddenly that your mind was a million miles away? You probably felt sorry and made up your mind to pay attention and always have been told that daydreaming is a waste of time.

　　 "On the contrary, "says L. Giambra, an expert in psychology, "daydreaming is quite necessary. Without it, the mind couldn't get done all the thinking it has to do during a normal day. You can' t possibly do all your thinking with a conscious(有意识)mind. Instead, your unconscious mind is working out problems all the time. Daydreaming then may be one way that the unconscious and conscious states of mind have silent dialogues."

　　　 Early experts in psychology paid no attention to the importance of daydreams or even considered them harmful. At one time daydreaming was thought to be a cause of some mental illnesses. They did not have a better understanding of daydreams until the late 1980s. Eric Klinger, a professor of psychology, is the writer of the book Daydreaming. Klinger says, "We know now that daydreaming is one of the main ways that we organize our lives, learn from our experiences, and plan for our futures. Day- dreams really are a window on the things we fear and the things we long for in life."

　　　 Daydreams are usually very simple and direct, quite unlike sleep dreams, which may be hard to understand. It's easier to gain a deep understanding of your life by paying close attention to your day- dreams than by trying to examine your sleep dreams carefully. Daydreams help you recognize the difficult situations in your life and find out a possible way of dealing with them.

　　　 Daydreams cannot be predicated (预料). They move off in unexpected directions which may be creative( 创造性的 ) and full of ideas. For many famous artists and scientists, daydreams were and are a main source of creative energy.

28. Which of the following isn't included among the things causing noise?

　 A. trucks　　　 　　　　 B. motorcycles　　 　 C. electric engines　 　　　　　　　　　　　　 D. jet planes

27. Some people have their hearing harmed __

　 A. while listening to pop music　　　　 　　 B. in complete silence

　 C. when speaking loudly　　　　　　　 　　 D. while watching TV

26. What does background music refer to?

　 A. Music played while people are working.　　 B. Music played in the backyard.

　 C. Noise that continues while you' re listening to other noises.

　 D. Music used to help people to concentrate.

25. According to this passage, the noise pollution __

　 A. has become the worst in the countryside　 　　　　　　　　　　　　　　　　 B. has become better in big cities

　 C. has spread from cities to villages　　 　　　 D. has been controlled in modern cities

24. From the second paragraph, we can infer the writer is sure that

　　 A. nothing cannot be done with friend　　　　　 B. only the first sentence is reasonable

　　 C. he who does not smoke or drink must be a good friend

　　 D. good friends should always help each other

二

　　 Life gets noisier every day and very few people can be free from noise of some sort or another. It doesn't matter where you live--in the middle of a modern city, or a faraway village--the chances are that you' 11 be disturbed by jet planes, transistor radios, oil - powered engines, etc. We seem to be getting used to noise, too. Some people feel quite lonely without background music while they' re working.

　　 Scientific tests have shown that total silence can be a very frightening experience for a human being. However, some people enjoy listening to pop music which is very loud, and this can do harm to their eardrums(耳鼓). The noise level in some discos is far above the usual safety level for heavy industrial areas.

　　 One recent report about noise and concentration(专心) suggested that although a lot of people say that any noise disturbs their concentration, what really influences their ability to concentrate is a change in the level of noise. It goes on to say that a background noise which doesn't change too much(music, for example) may even help people to concentrate.

23. From the passage we can learn that

　　 A. the writer and his ideal friend have a lot to learn from each other

　　 B. the writer has a lot to learn from his ideal friend

　　 C. the writer's ideal friend has a lot to learn from him

　　 D. the writer has only a little to learn from his ideal friend

22. An ideal friend means

A. a true friend　 　　　 B. a false friend　 　 C. an imaginary friend　 D. an excellent friend

21. This passage tells us __

　 　 A. how to make friends with others　　　　　 B. how the writer' s friend helps him

　　 C. what kind of person the writer's friend is　　 D what kind of person we should make friends with