Three kids have been learning chemistry for only a few months. But they have already begun to challenge (挑战) a world famous scientist!
Li Weichi, Huang Runling, and Xiao Yan are from Zhongshan Huaqiao Middle School in Guangdong. They have just found a red cabbage that could be a new kind of acid-base indicator (酸碱指示剂). They want it to take the place of litmus (石蕊) paper.
"We’ve learnt to think of and ask questions about life by ourselves," said Li, "We work well with each other."
British scientist Robert Boyle discovered the use of litmus paper over 300 years ago. Now it is used widely in experiments all over the world.
But when the kids did some experiments in class last winter, they saw that the litmus paper didn’t turn very blue with base matter. It’s hard to get a clear result.
Will there be a better indicator than litmus paper? The three kids decided to try and find out!
How? They went to collect over 40 plants in parks, gardens and markets. Then they ground (研磨) leaves, flowers and stems (茎) to get the pigments (色素) from them.
The kids mixed pigments with acid and base. They spent months watching carefully to see which paper showed the best colour change. They decided it was the litmus paper!
"It’s our first scientific journey, Huang said, "But it makes me want to try harder." Whom did the three kids want to challenge?
A.Their chemistry teacher. | B.Their headmaster. |
C.Robert Boyle | D.Thomas Edison |
From the text, a red cabbage is a kind of ____.
A.plant | B.animal | C.paper | D.liquid |
What is widely used as the acid-base indicator now?
A.red cabbage | B.litmus paper |
C.any plant | D.any flower |
The story mainly tells us ____.
A.how to make litmus paper | B.about the three kids’ spirit |
C.scientists were wrong | D.the kids are heroes |
Are you able to send a letter with pictures and sounds to someone, anywhere in the world without putting a stamp on it? With an e-mail you can just do that. Using computers you can send e-mails quickly and easily. The post is much slower than email. E-mail can send its messages to the other side of the world in seconds.
E-mail is easy to use and it saves time and money. The different time and different parts of the world do not matter when you send an e-mail. It does not matter if your friends are in bed when you send an e-mail to them, or you are seeing a film at the cinema when they send an e-mail back.With an e-mail you can send a letter without putting _____ on it.
A.an address | B.a message | C.a word | D.a stamp |
The writer wants to tell us something about ______.
A.computer | B.a letter | C.e-mail | D.a call |
Which of the following is true?
A.E-mail is not easy to use. |
B.E-mail saves time and money. |
C.E-mail comes only at night. |
D.E-mail is slower than the post. |
When can you send an e-mail to your friend?
A.In the day. | B.At night. |
C.At any time. | D.When your friends are at home. |
How long does it take to send an e-mail?
A.Within seconds. | B.More than one hour. |
C.A few days. | D.It depends on the distance. |
You are busy with your job but want to make new friends? You miss your old friends and try to find them? Then try a new website --- Facebook.
Mark Zuckerberg,a Harvard student,created Facebook only about eight years ago. At first,it was only for Harvard students. Soon it became popular on the Internet. Now over 25 million people around the world use it to keep in touch with their friends. People like Facebook because it makes them feel comfortable. On Facebook,they share joys or sorrows (悲伤) by posting pictures and videos. What's more,they leave messages and give online presents to their friends. Now Facebook,like eBay,is a place to sell things.
The best part about Facebook is to help find old friends. For people,the only thing to do is to sign their real names. Then it takes a short time to sign their old friends. So have fun with Facebook if you love to be with friends,old or new. Facebook was created_________.
A.twenty years ago |
B.thirty years ago |
C.by Mark Zuckerberg and his classmates |
D.by a Harvard student named Mark Zuckerberg |
According to the passage,what can you do on Facebook?
①You can give online presents to your friends.
②You can play online games with friends.
③You can share joys or sorrows with friends.
④You can leave messages.
⑤You can sell things.
A.①②④⑤ | B.①③④⑤ | C.②③④⑤ | D.①②③④ |
According to the passage,eBay is a website
A.for shopping | B.for making friends |
C.for taking pictures | D.for listening to music |
Which of the following is TRUE?
A.It takes you a long time to find old friends on Facebook. |
B.Now Facebook is a website only for students. |
C.The best part about Facebook is to make new friends. |
D.You have to sign your real name if you want to find your old friends on Facebook. |
What is the best title for the passage?
A.Something about Facebook. |
B.Facebook and eBay. |
C.How to make new friends. |
D.Have fun chatting online with your friends. |
Animals are our friends. We can find different kinds of animals on Earth. Some animals are living in big forests. And some animals are living with man.
Animals are very important to man. For example, people can train the elephants to do some heavy work. And they can also train the dogs to look after the house. A police dog is clever. It can help people in danger. And it can also help the policeman to catch the thieves or murderers. The children like dogs very much.
Everyone knows sheep and pigs very well. Man eats their meat almost every day. People can make coasts and shoes with their skins. From cows, we can get milk. It’s good for our health. And horses can take us to other places. In some places, horses and camels are instead of car and buses. It’s clear that man can’t live comfortably without these animals.What does “train” mean in the passage?
A.锻炼 | B.训练 | C.火车 | D.瞄准 |
_______can be used to look after the house.
A.Only sheep and pigs | B.Horses and cows |
C.Dogs | D.All the above |
We can get milk from______.
A.dogs | B.pigs | C.hens | D.cows |
Life will be difficult without________.
A.animals |
B.sheep and pigs |
C.the animals which live in the forest |
D.the animals which live with man |
If you want to go to other places, you can take_______.
A.horses or camels | B.buses |
C.cars | D.all the above |
Jack is a twelve-year-old boy. One day, he was playing football. The ball went into the street and Jack ran for it. Unfortunately, a car hit him. Jack’s parents took him to the hospital at once. Jack woke up after a month. When he woke up, he asked, “Who am I? Who are you? Why am I here?” He even didn’t know his parents. The doctor said, “Jack’s head was badly hurt. Maybe he can remember all the things he has lost one day. Maybe he will forget them forever.” Every day Jack’s parents told Jack something about himself, his friends and so on. But Jack still couldn’t think of anything. One day, when his father talked about his dog, Tidy, Jack seemed to think of something. Then Jack’s father had an idea. He took Jack back home. Jack and Tidy played together happily. After a year, with the help of Tidy, Jack’s memory came back. What happened to Jack one day?
A.A car hit him. | B.His ball was missing. |
C.He was ill. | D.He was lost. |
What was Jack’s problem?
A.He couldn’t get to sleep. |
B.He couldn’t wake up. |
C.He lost his memory. |
D.He couldn’t move. |
Who helped Jack remember the things?
A.His father. | B.The doctor. |
C.His mother. | D.His dog. |
How long did it take Jack to remember the things?
A.A year. | B.A month. |
C.A week. | D.We don’t know. |
Which of the following is Not True?
A.Jack is twelve years old. |
B.Jack’s parents took Jack to the hospital immediately. |
C.When his father talked about Tidy, Jack thought of something. |
D.The doctor was sure that Jack could be cured one day. |
Hello, I’m Linda. This is Jen. She’s my mum. She’s 38 years old. She’s wearing a red coat, a pair of red shoes and a pair of blue pants. She often wears a big hat, too. She is a teacher. And the students in her school like her very much. She likes singing (唱歌). But she doesn’t like (不喜欢) playing sports. On Sundays, she goes shopping with me.
根据短文内容,选择正确答案。Jen is Linda’s .
A.friend | B.mum | C.classmate | D.sister |
What is the colour of Jen’s shoes?
A.Red. | B.Blue. | C.Green. | D.Black. |
Jen is a .
A.nurse | B.doctor | C.teacher | D.manager (经理) |
Jen likes .
A.painting | B.reading | C.writing | D.singing |
What can you learn from the passage (短文)?
A.Jen is 48 years old. |
B.Jen likes playing sports. |
C.Jen is wearing a pair of red pants. |
D.Jen goes shopping on Sundays. |