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."

1. Whom did the three kids want to challenge?

A. Their chemistry teacher.     B. Their headmaster.

C. Robert Boyle              D. Thomas Edison

2. From the text, a red cabbage is a kind of ____.

A. plant　　B. animal　　C. paper　　D. liquid

3.What is widely used as the acid-base indicator now?

A. red cabbage              B. litmus paper

C. any plant                D. any flower 

4.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

 

Hello, everyone! My name is Betty. I’m thirteen years old. I’m in Class Two, Grade Seven. This is our school.

There are 800 students in my school. There are twenty-four classrooms in our school. In our school we have a big library. It’s behind our classrooms. There are many books in it. We can read them and learn a lot from them. The science building is near the library. There are some science labs in it. The playground is between the science building and the dining hall. We often have our lunch in the dinning hall. It’s our playground. After school, we can play football on the playground. Some of us love running. We can also run there.

1.There are _____ classrooms in Betty’s school?

A. 12           B. 14               C. 24             D. 34

2.Where is the library?

A. Behind the classrooms            B. In front of the classrooms            

C. Near the classrooms              D. On the left of the classrooms

3.There are some _______ in the science building.

A. science labs                    B. computer rooms   

C. classrooms                     D. teacher’s offices

4.We have ______ in the dining hall.

A. breakfast         B. lunch       C. dinner       D. supper

5.We can  ______ on the playground.

A. play basketball                  B. play football

C. play table tennis                 D. swim

 

NO.4 Middle School
Kunming, Yunnan
April 2nd, 2004
Dear editor（编辑）
I live in a beautiful city. Many visitors come to my city. There are so many colorful peacocks(孔雀)here .The peacocks mostly live on the grass land of Dongfeng Square（广场）
They are given food freely by visitors ,They usually throw food to them ,and  don’t think about at all whether the food is right or not. Some of the peacocks became ill, some even died after eating the bad food given by the visitors . I’m sure most of the visitors who throw food to the peacocks really like the birds ,but don’t realize(意识到)that they may be doing them harm (伤害).The visitors should be told that what have done is very harmful to the birds , and this kind of thing must be stopped from happening Perhaps we can build some small shops beside Dongfeng Square to sell peacock food .For us every person, it’s our duty to give more love to these beautiful birds and to look after them carefully.
Yours,
Sun Yan
【小题1】Many visitors come to the writer’s city to           

A．do some shopping

B．see beautiful peacocks

C．play on Dongfeng Square

D．eat nice food

【小题2】Some peacocks became ill and died because some visitors            

A．didn’t give them any food

B．gave them too much food

C．threw them some bad food

D．loved them and played with them

【小题3】Some shops can be built beside Dongfeng Square so that they may            

A．sell food for visitors

B．sell food for peacocks

C．make the square more beautiful

D．have the beautiful birds

【小题4】From the passage we know people should            

A．live and play with the birds

B．stop the birds from eating too much

C．give right food to the birds

D．give more food to the birds

【小题5】We can guess the writer of the letter, Sun Yan ,may be a            

A．visitor	B．shopkeeper
C．square keeper	D．student

We have only one Earth. It's our common _.

A. family    B. house C. home D. room

 

阅读下列各小题，根据括号内的汉语提示，用句末括号内的英语单词或其适当的形式完成句子，使句子完整通顺。

1.It’s our duty to                                                       .(尽我们最大的努力去帮助残疾人)  （try）

2.They closed all the windows                                            (为了房间更加保暖).（order）

3.---Why don’t you go hiking in the mountains at weekends?

---                                      (我害怕蛇) when I am in the forest.    (afraid)

4.---                                            (你是怎样了解到)the news?   (know)

---Teacher told me by sending a message on the mobile phone.

5.---                                    (你的哥哥长得是什么样的)？

---He is of medium build, and he has short hair.    ( look )

6.---Do you often listen to the music while you are doing housework?

--- Yes, it                               （使我放松）when I am busy.    (make)

7.---How long have you been an English teacher?

---                                 (自从我放弃了医院的工作)in 2000.    (give)