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. |
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| 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) |
In the first part of the experiment the cotton wool is most probably used to ______________.
| A．keep the air dry | B．keep the tube wet |
| C．make the nails rust | D．keep the tube clean |
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
| A．①② | B．①③ | C．②③ | D．②④ |
We can conclude from the experiment that only ____________ makes iron rusty.
| A．dry air | B．cotton wool | C．ordinary water | D．air-free water |
It’s feeding time at the zoo，and Mr King，the keeper，has ten animals to feed．
Mr King likes feeding the animals．First he goes to the elephants and feeds them and talks to them a bit．Then he goes to the parrots．Everyone watches while he feeds the parrots so that it takes him a long time．Then he goes up to the wolf house，where he has two wolves，and then he goes next door to the tigers．After he feeds the wolves and tigers，he goes to the snake house．Not very many people like snakes，so there aren’t many people there．Then he goes on to feed the zebras．and after that to the squirrels．He has a baby squirrel at the moment．so he spends some time 1ooking after him．Then he goes to the swans，and then to the birds．Last of a11，he feeds the pandas．People like pandas very much．They live only in China．
根据短文内容，按顺序排出Mr King喂养动物的路线。
将下列图的序号填入上图表的方框内。
Joy always rides her bike to school. It’s four miles to school and it takes her about fifteen minutes. Joy likes riding to school. She says it’s good for her health.
Edward usually goes to school by bus. He likes talking with his friends on the bus. It’s about ten minutes’ journey (旅程) to school by bus.
Mary’s home is near the school. She usually walks to school. It’s about five minutes’ walk. Mary says she likes taking walks after meal.How does Joy go to school?
Is riding good for Joy’s health?
Why does Joy like riding to school?
Does Edward like talking with friends on the train?
How far is it from Mary’s home to her school?
Every year there is a Spring Festival in China. Usually it is in January or February. It is the most important festival in China. So before it comes， everyone has to prepare things. They buy pork， beef， chicken， fruits and many other things. And they often make a special kind of food—“dumplings”. It means “come together”. On the day before the festival，parentsbuy new clothes for their children. Children also buy presents for their parents. On the Spring Festival Eve（除夕），all the family members come back to their hometown. This is a happy moment. Some sing and dance，some play cards and others get the dinner ready. When they enjoy the meal， they give each other the best wishes for the coming year. They all have a good time.Which is the most important festival in China?
A. The mid-autumn Festival.
B. The Spring Festival.
C. Children’s Day.When is the Chinese Spring Festival usually celebrated?
A. In March or April.
B. In May or June.
C. In January or February.is the special kind of food for the Spring Festival in China.
A. Chicken B. DumplingC. FishWhat’s the meaning of the food “dumplings” for Chinese people in the Spring Festival?
A. Look up.
B. Help yourself.
C. Come together.The family when they are having dinner together on the Spring Festival Eve.
A. give each other the best wishes
B. buy each other presents
C. sing， dance and play cards
At midnight (半夜) Mr. King coughed again. He got up and took some medicine. Before he lay down again, he smoked. And he couldn't go to sleep any longer. He found the medicine book and began to read it. He was afraid he had lung cancer(肺癌). He seemed to see death was waiting for him. Tears (眼泪)ran down his face. He didn’t see his wife was standing by him.
“What’s wrong with you, dear?”asked the woman.
“Nothing,” the old man answered and covered his face with his hands.
The old woman opened the book and understood at once. She said, “You must stop smoking right now.”
“I began to smoke when I was nine, you know. How can I do that?”
“But I think health is more important.”
Mr. King coughed again and his wife said, “Go to see a doctor tomorrow. He will be able to help you, I think.”
The doctor told Mr. King to have an X-ray examination（X光检查）of his lungs. And then he looked at the X-ray carefully for a long time.
“Tell me the truth, doctor.” said Mr. King, “Do you see any shadows (阴影) in my lungs?”
“No, I don’t see anything.”
“Yes?” the old man said happily. “Really?”
“Yes. Your lungs are turning black. How can I see any shadows?”Mr. King got up to.
A. smoke again
B. take some medicine
C. read the medicine book.Mr. King coughed because.
A. he couldn’t go to sleep
B. he was afraid to die
C. he smoked too much, so tears ran down his face.
A. Mr. King thought he had lung cancer
B. Mr. King couldn’t understand the book
C. Mr. King was too sad to go to sleepThe doctor told Mr. King to have an X-ray examination because.
A. he was sure the man would soon die
B. he wanted the man to stop smoking right now
C. he wanted to know if there was something wrong with his lugs.Which of the following is true?
A. There was nothing serious with Mr. King.
B. Smoking too much caused Mr. King’s lungs to turn black.
C. The doctor found some shadows in Mr. King’s lungs.
Mr Green works in an office(办公室). Every morning he has breakfast with his wife at 7:30, watches TV, drinks tea(喝茶) and then leaves his home at 8:00 and takes a bus to his office.
Now he still sits comfortably at the breakfast table and watches his news on TV at 8:05. He doesn’t hurry and asks his wife for another cup of tea.
“Another cup?” she says in surprise (吃惊的). “Don’t you need to go to the office today?” “The office?” he says, “I think I’m at the office!”Mr Green works in a(an) ______.
| A．school | B．hotel |
| C．office | D．hospital |
Mr Green usually goes to work by _______.
| A．car | B．bus |
| C．bike | D．train |
Mr Green likes ________ every day.
| A．running | B．playing basketball |
| C．watching TV | D．drinking coffee |
Mrs Green is surprised because Mr Green_________.
| A．doesn’t drink tea |
| B．doesn’t watch TV news |
| C．doesn’t go to work |
| D．doesn’t have breakfast |
Mr Green forgets(忘记) that he is _________.
| A．at home | B．at his office |
| C．on the bus | D．in his car |
考点：记叙文。