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It is said that all dreams serve a purpose（目的）. While there is no agreement among scientists about why we dream, there are many ideas about the different kinds of dreams we have.

One common kind of dream is the repeating dream, in which the same story is repeated again and again, often for many months or even years. Some believe these are a sign people have a problem in their life and once that problem is gone then the dream will stop. Others think they are a way to help people remember something very important.

Another well-known kind of dream is the nightmare. The pictures and stories in such dreams make people very afraid and dreamers usually remember them far more clearly than normal dreams. The cause of such dreams may be seeing something terrifying such as a car accident or some deadly snakes. Others think such dreams may be trying to make a person pay attention to something that is dangerous in their life.

Daydreams happen during wake-time when we forget where we are or what we are doing and find ourselves in a made-up story or unreal world. We often daydream when we are doing something that is not interesting or exciting. They help us think about our future.

Lucid dreams are the most fun. These happen when dreamers suddenly understand that they are dreaming. Instead of waking up, they stay in the dream and are able to control what happens in the dream as if they are making a movie.

1.The underlined word “they” (in paragraph 2) refers to “_________”.

2.The underline word “terrifying” (in paragraph 3) is closest in meaning to _________.

3.When might a person daydream?

4.How do we know if we are lucid dreaming?

5.What is the best title of the passage?

Do you or your family often go on a trip? Which means of transportation would you like to take, the train, the ship or the plane (飞机) .

     Taking a train is really cheap, but something it' s really crowed.   56   It is noisier (更吵闹的)than taking a ship or a plane. But it is safer(更安全) than the other two ways, I think.

     During trips by ship, you can play games, meet interesting people or have a party   57   And it takes a long time by ship ,too.

     Trips by plane are different. Although it' s more expensive than by train or ship, it Is faster (更快的). You can read a book, see a movie or have a good sleep, It' s quieter than a train or a ship. The best thing is that you can get the view of the world above the clouds. It is so exciting.

1） 从下面四个句子中选择合适的句子填在文中的横线上。

       A. So maybe you don’t have a seat．

       B. Taking a train is more dangerous than taking a plane．

       C.You can enjoy a lot on a ship．

       D．But when the sea isn’t calm，you may get seasick(晕船)．

      1．_______   2．________

2)根据短文内容，选择最佳答案。

3．Which of the following is the advantage(有利之处)of taking a train．

       A. It is faster．       B. It is safer．

       C. It’s much noisier．  D. Sometimes the train is crowded．

4．What can people NOT do on a plane?

       A. Play games．      B. See a movie．    C. Have a good sleep．D. Read a book．

5．What does this passage mainly(主要的)talk about?

       A. Three means of transportation．

       B. How to go on a trip by ship．

       C. Going on a trip in different ways．

       D. Why people go on a trip by plane．