A Simple Scientific Experiment
Below is a description of a single scientific experiment. It shows us how iron reacts ( 反应) with air and with water.
Aim : To find out if iron rusts( 生锈) (a) in dry air ; (b) in water that has no air in it ( air- free water) ; (c) in ordinary water.
Materials : 3 clean iron nails ( 铁钉) ; test tubes ; test tube holder ; cotton wool ; oil ; Bunsen burner.
Iron in dry air
Method
(1)Put some iron nails at the bottom of a test tube.
(2)Push some cotton wool down the tube.
(3)Leave the tube for one week.
Result
After one week, the nails have not rusted.
Conclusion
Iron does not rust in dry air.
Iron in air-free water
Method
(1)Half-fill a test tube with water.
(2)Boil the water for three minutes. (This makes sure there is no air in the water.
(3)Put two or three clean nails in the water.
(4)Add some oil to the water. (This will keep air out of the water.)
(5) Leave the tube for one week.
Result
The nails do not rust in the tube with air-free water.
Conclusion
Iron does not rust in air- free water.
Iron in ordinary water
Method
(1)Half –fill a test tube with water and add two or three clean nails.
(2)Leave the tube for one week.
Result
The nails rust in the tube with ordinary water.
Conclusion
Iron rusts in ordinary water. (238 words)

1. 1.

   In the first part of the experiment the cotton wool is most probably used to ______________.

   1. A.
      keep the air dry
   2. B.
      keep the tube wet
   3. C.
      make the nails rust
   4. D.
      keep the tube clean
2. 2.

   What are necessary steps to make sure the water in the tube is air free?
   ①Leave half a tube of water in it              
   ②Boil the water for some time
   ③Put some clean iron nails in the tube           
   ④Add some oil to the water

   1. A.
      ①②
   2. B.
      ①③
   3. C.
      ②③
   4. D.
      ②④
3. 3.

   We can conclude from the experiment that only ____________ makes iron rusty.

   1. A.
      dry air
   2. B.
      cotton wool
   3. C.
      ordinary water
   4. D.
      air-free water

Have you ever seen snow? Many people in the world have not. Some countries never have snow; some have only a little on the tops of very high mountains. In the north of England, there is quite a lot of snow every winter, but in the south of England, there is usually little.
When a student from a warm country comes to England in autumn for the first time, he feels cold at first. There are often dark clouds, grey sky and cold rain in England in autumn, and most students from warm countries do not like this.
But snow is different. Though it is cold, it is also beautiful. Perhaps, after several dark mornings, the student wakes up one day, and there is a lot of light in his room. He thinks “Is it so late?” and jumps out of bed. But no, it is not very late. He looks out of the window and there is the snow on the ground and on the houses and everywhere. The light of his room comes from clean, beautiful snow.
【小题1】In which part of England is there much snow in winter?

Three friends, Tom, David and John, came to New York for their holiday. They stayed in a very large hotel. Their room was on the 45^th floor.
In the evening, the three men went to the cinema and came back to the hotel very late.
“I’m very sorry,” said the man of the hotel, “but our lifts(电梯) do not work tonight. If you don’t want to walk up to your room, I’ll make beds for you in the hall(大厅). ”
“No, thanks,” said Tom, “we don’t want to sleep in the hall. We will walk up to the 45^th floor. But I know how to make it easier. On the way to our room, I’ll tell you some jokes. Then you, David, will sing us some songs. Then you, John, will tell us some stories, all right?”
So they began to walk upstairs. Tom told them many jokes. David sang them some songs. At last they came to the 34^th floor. They were tired and had a rest.
“Well,” said Tom. “Now it’s your turn, John. After all these jokes and songs, tell us a long and interesting story with a sad ending. ”
“OK, I’ll tell a sad story,” said John, “It’s not long but very sad. I forgot to bring the key to our room with me. It’s still in the hall. ”
【小题1】The three friends came to New York to         .

This term, I came to Chou Zhou Middle School. There are 42 classes, 110 teachers and 2400 students in the school.
In the middle of the school there is two tall buildings. They are for us to have classes. All the classrooms are there. There are some small rooms, too. They are offices for the teachers to work. All the teachers get ready for their lessons there.
In front of the tall buildings, there is a small one. It is the library. There are many books there. The teachers and the students like to read books in it. Sometimes they borrow(借) books from it.
There is a sports hall behind the tall buildings. The boys often play basketball there happily. Of course, there is a science building in my school.
This is my school. It’s not only big, but also nice. I like my new school very much.
【小题1】There are ________ classes in Chou Zhou Middle School.