Do you know why people look the way they look? What inside our bodies makes us grow in a certain way? The answer is DNA. It was first discovered by a young Swiss doctor in 1868.
DNA is like a computer program for your body. Almost every cell(细胞) in your body includes DNA. The way DNA in the cell decides why you are the way you are. For example your friend might have larger ears than you. This is because their DNA is different from yours.
DNA lives in the cell and is ordered in a structure called a “double helix(双螺旋)”. In each double helix there are links called as chromosomes(染色体). These chromosomes are made from four bases that arrange themselves in millions of different ways. The way these bases choose to line up is what makes the DNA code for that cell.
DNA is also called a “gene(基因)”. This is a very interesting thing. Genes are passed down from your parents. That is why you might have the same smile like your dad’s or mom’s!
In February, scientists found the skeleton(骨架) of Richard III, King of England from 1483-1485, under a car park in England. It seems unlikely that scientists could identify a 527-year-old skeleton. However, they matched the skeleton’s DNA to a sample from one of his direct descendants(后代). How amazing! _______ discovered DNA.
A. A Swiss scientist B. A Swiss doctor
C. A young student D. A Swiss worker Which of the following is Wrong?
A. DNA is a part of the cell.
B. Different people have different DNA.
C. The chromosomes are made up of four bases.
D. Scientists could not identify a 527-year-old skeleton. What is the main function of “genes”?
| A．They decide your children’s appearances or characters. |
| B．They make your children have the same smile as you. |
| C．They make your children stay healthy. |
| D．They’re good for scientific researches. |
What’s the main idea of this passage?
A. What decides DNA. B. How DNA is arranged.
C. What genes are like. D. How DNA works in our body.
Mr. Robinson never went to see a dentist, because he was afraid(害怕), but then his teeth began aching a lot, and he had to see a dentist. The dentist did a lot of work in his mouth for a long time. On the last day Mr. Robinson asked the dentist, “How much is all the work going to cost（花费）?” “Twenty-five dollars,” said the dentist. But he didn’t ask him for the money. After a month Mr. Robinson phoned the dentist and said, “You haven’t asked me for any money for your work.” “Oh,” the dentist answered, “I never ask a gentleman（绅士）for money.” “Then how do you live?” Mr. Robinson asked. “Most gentlemen pay me quickly, the dentist said, “but some don’t. I wait for my money for two months, and then I say, ‘That man is not a gentleman,’ and then I ask him for my money.Mr. Robinson _____ until his teeth began aching a lot.
| A．wasn’t afraid |
| B．didn’t see a dentist |
| C．wanted to see a dentist |
| D．went to see a dentist |
_____ cost twenty-five dollars.
| A．The first day’work of the dentist |
| B．The last day’s work of the dentist |
| C．Half the dentist’s work |
| D．All the dentist’s work |
When did Mr. Robinson phone the dentist?
| A．After he paid him. | B．About thirty days later. |
| C．After two months. | D．About twenty days later. |
The dentist said that he never asked _____ first.
| A．a woman for money | B．the poor for money |
| C．gentlemen for money | D．people for much money |
Mr. Robinson never went to see a dentist _____.
| A．because he was afraid |
| B．because he had no money |
| C．because he wasn’t a gentleman |
| D．because he didn’t want to much money |
Mr. Smith teaches English in a university(大学）. He is often busy with his work. When summer or winter holidays come, he often goes out to take vacations to relax. Usually he goes to France because he thinks it’s an interesting country. And he can speak French very well. But last month he said to his wife, “ I’m not visiting France this time. I want to go to a different country. I choose China. But I can hardly speak Chinese, so I’m going to study it for a month before I go.” he studied pretty hard for a month, and then his vacation began. Ten days later, he came back home. His wife asked him, “ How about your short vacation in China? Did you have any trouble with your Chinese there?” “No, I didn’t.” answered Mr. Smith. “But the Chinese did!”Mr. Smith goes out to ____when it’s summer or winter holidays.
| A．have a rest | B．learn languages |
| C．look for interesting jobs | D．visit musuems |
The unlined word “choose” mean____.
| A．learn from | B．arrive in |
| C．work for | D．decide on |
Mr. Smith stayed in China for ____.
| A．a month | B．two weeks |
| C．ten days | D．The author didn’t mention it. |
Which of the following is TRUE?
| A．Mr. Smith works as a math teacher in a university. |
| B．Mr. Smith takes vacations in different countries every year. |
| C．Mr. Smith can speak English and French very well. |
| D．Mr. Smith went to China with his wife. |
What can we know from the last paragraph(段落)?
| A．Mr. Smith’s Chinese is quite good. |
| B．The Chinese were friendly to Mr. Smith. |
| C．Mr. Smith speaks Chinese well. |
| D．Chinese is difficult to learn. |
Everyone must go to bed early and get up early, or we won’t be healthy and clever.
Is this true? Perhaps it is. The body must have enough sleep. Children of your age need ten hours’ sleep every day. If you don’t go to bed early, you won’t have enough sleep. Then you can’t think properly and can’t do your work properly. You’ll not be clever.
Some people go to bed late and get up late. This is not good for them. We must sleep at night when is is dark. The dark helps us to sleep soundly. When the daytime comes, we must get up. This is the time for exercise. If you lack exercise, the body becomes weak. Exercise keeps a strong body.
Exercise helps the blood（血液）flow（流动） around inside the body. This is very important. Blood takes food to all parts of our body. The brain also needs blood. If we keep our body healthy and take exercise, we can think better.If we want to be healthy and clever, we must go to bed____.
| A．late and get up early | B．early and get up late |
| C．early and get up early | D．late and get up late |
Children of your age need____.
| A．ten hours’ sleep | B．nine hours’ sleep |
| C．twelve hours’ sleep | D．eleven hours’ sleep |
The best time to sleep is when____.
| A．daytime comes | B．it is dark |
| C．we are taking exercise | D．it is late afternoon |
If you lack exercise, the body becomes weak. “Lack” means “______”
| A．加大 | B．坚持 | C．丰富 | D．缺乏 |
Exercise ______.
| A．makes more blood | B．helps the blood to flow |
| C．makes food for our blood | D．makes our brain tired |
Everybody wants to be healthy. Everybody knows food is very important. There are many healthy foods. You can have more bananas, apples, oranges, tomatoes and lettuce because fruits and vegetables are good for you. But don’t eat too much chocolate. It’s not healthy food. Healthy food can make you strong and happy. Remember there is an old saying, “An apple a day keeps a doctor away.” Sports can also keep you healthy. Get up early and do sports every day. Don’t be lazy! You will be healthy and happy.Which is right?
| A．Everybody is healthy. |
| B．We want to be healthy. |
| C．We are important. |
| D．Only food can keep us healthy. |
What are healthy foods?
| A．Fruits and vegetables. | B．Bananas, apples and chocolate. |
| C．Fruits and chocolate. | D．Chocolate. |
Why are healthy foods good for you?
| A．They make you happy. |
| B．They make you grow strong. |
| C．They make you strong and happy. |
| D．They are delicious. |
What the meaning of the sentence --- “An apple a day keeps a doctor away!”?
| A．The doctor goes away when he sees an apple |
| B．The doctor runs away when you give him an apple |
| C．You eat an apple every day and you can be healthy. |
| D．You eat an apple every day and you can be a doctor. |
What can keep you healthy?
| A．Only doctor. |
| B．Both healthy foods and sports |
| C．Only healthy foods. |
| D．Only sports. |
This is a beautiful park near my home. People like to go to the park after work. Some of them go to the park every day. Look! This is Mr. Smith. He is sitting on a chair and watching the children. Some children are playing the game of hide-and-seek（捉迷藏）. Some boys are playing yo-yo. Lucy and lily are standing under a tree. They are talking. There is a small river in the park. We can see some boats in the river. Some children are sitting in the boats with their fathers and mothers. Listen, a lot of birds are singing in the trees. This is really a nice park. I come here to read English after school every day._________ like to go to the park.
| A．Children | B．Fathers and mothers |
| C．Lucy and Lily | D．People |
Mr. Smith is__________
| A．playing hide-and-seek | B．playing yo-yo |
| C．sitting and watching the children | D．singing |
Which one is right?
| A．Lucy and Lily are playing hide-and-seek with other children |
| B．Lucy and Lily go to the park only on Sunday. |
| C．Lucy and Lily are talking under the tree. |
| D．Lucy and Lily live far from the park. |
The writer can’t see_______ in the park?
| A．fish | B．children | C．women | D．men |
What’s the writer doing?
| A．He is singing |
| B．He is sitting in a boat |
| C．He’s playing a game |
| D．He’s watching the people in the park |