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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 color 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

 

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

 

词语填空

	he around　 head　 great child work then one　 late at

Thomas Edison wore many caps during his life. First he was just a poor 　 61　 boy. He wore caps of many kinds. He worked 　62　 a station, too. It was there that he got 　63 first experience with electricity. 　64　 in life he became a famous man inventing many things.

65 he wore the caps of many famous schools and colleges. But his most important cap was thinking cap.

If we looked 　66　 us, we can see many of Edison’s inventions. The electric lights shining in our rooms are one of his 　 67　 inventions. He developed the telephone ringing in our homes. Records playing songs and beautiful music were his brain 　68　 . He made the

　 69　 moving pictures.

　 Usual caps keeps the 　70 warm. But thinking caps keep the world warm.

In one way of thinking. failure is part of life. In 　31 way, failure may be a way towards success. The “Spider-story” is often 　32 .Robert Bruce , leader of the Scots in the 13 ^th century, was hiding in a cave from the English. He watched a spider 　33 a web. The spider tried to reach across a rough 34 in the rock. He tried six times. On the 　35 time he made it and went on to make his web. Bruce is said to have been encouraged by this and to have gone on to 　36 the English . Edison , the inventor of the light bulb, made 37 　models that failed before he found the right way to make one. Once he was asked 　 38 he kept on trying to make a new type of battery when he had failed so often, he replied, “Failure? I have 　39　 failure. Now I know 50,000 ways it won't 　 40 ”.

So what? First，always think about your failure. What caused 　41 ？Were conditions right? Were you in top from yourself? What can you change? So things will go 　 42　 next time.

Second, is the goal you're trying to reach the right one? Try to do some 　 43　 about what your real goals may be. Think about this question. “If I do succeed in this, where will it get me?" This may help you prevent failure in things you shouldn't be doing any way.

The third thing to keep in 　44 about failure is that it's a part of life. Learn to “live with yourself" even though you may have 　45 ．

(　 )31. A. other　　　 B. another　　　　　　　　　　 C. first　　　　　 D. second

(　 )32．A. told　　　　 B. said　　　　　　　　　　　　 C. talked　　　　 D. spoken

(　 )33. A. doing　　　 　　　 B. taking　　　　 　 C. making　 　　　 D. playing

(　 )34．A. room　　　　 　　　 B. house　　　　　 　 C. place　　 D. soil

( )35. A. tenth　　　 B. sixth　　　　　 　　 C. eighth　 D. seventh

(　 )36．A. save　　　　 B. help　　　　　 　 C. defeat　　 　　　 D. kill

(　 )37．A. hundred　　 B. hundreds　　 C. hundred of　 D. hundreds of

(　 )38. A. why　　　　 B. when　　　　　 C. what 　　　 D. who

(　 )39. A. not　　　　 　　　 B. no　　　　　　 　 C. never　 　　　　　 D. nothing

(　 )40．A. do　　　　 B. make　　　　　 　 C. take　 　　　　　　 D. work

(　 )41. A. one　　　　　 B. it　　　　　　 　　 C. that　 　　　　　　 D. this

(　 )42．A. high　　　　 B. large　　 　　　　 C. right 　　　　　　 D. bright

(　 )43．A. Thinking　　 B. shopping　　　 　 C. reading 　 D. cleaning

(　 )44. A. heart　　　　 B. eyes　　　　　 　 C. ears　　 　　　　 D. mind

(　 )45. A. failed.　　　 B. succeeded　　　 　 C. finished　　 D. passed

选择填空:

Edison's mother taught him ______ after he left school.

[　　]

A. himself　　  B. herself

C. themselves   D. yourself