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He was born in 1371 and, 11 years later, was caught by the army of a rich young man called Zhu Di
and made to work for him. Over time the rich man saw that Zheng He was very clever and strong and they
became close friends. In 1403 Zhu Di was made the King of China and he asked Zheng He to join his new
government.
The King wanted to learn more about the world and show other countries his power. He ordered many
new ships to be built and made Zheng He their leader. Between 1405 and 1433, Zheng He led seven sea trips
to different parts of the world. He certainly travelled to India, Africa and the Middle East. A few people think
his ships may have even reached South America and Australia.
Each trip lasted between two and four years and it is believed he sailed more than 50 000 kms during the
years of his travels. With 28 000 men and over 300 ships, such as boats for food, water and even soldiers'
horses, Zheng He led a fleet (舰队) whose size would not be equalled by Europeans for over 500 years I
On these trips he brought with him many Chinese goods like silk and medicine to give to foreign kings or
to sell for local goods. He returned from each trip with boats filled with expensive things such as gold and
jewellery, foreign guests and strange animals like a giraffe.
It is a pity that we may never learn everything about Zheng He' s travels. After he died in 1433, the new
king, who believed these trips were unlucky and too expensive, had them stopped and he burned almost all
the books about Zheng He's travels. It is only in the last 50 years that historians have begun to carefully study
the adventures of the great Zheng He.
B. To show the world how strong the King was.
C. To receive gifts from the kings of other countries.
D. To discover unusual animals.
B. Each of his trips lasted one year.
C. He died at the age of 62.
D. He was a successful businessman.
B. Gold.
C. Animals.
D. Silk.
B. His ships were all burned.
C. The new king wrote a book about him.
D. Sea trips to other countries were stopped.
a. Zhu Di became the King.
b. Zheng He was caught by soldiers.
c. The books about Zheng He were all burned.
d. Foreigners were brought to China.
e. Zheng He visited India.
f. New ships were built.
B. b, a, e, d, c, f
C. f, a, b, d, c, e
D. b, a, f, e, d, c
If we are driving a car or crossing a street, we will stop when the traffic lights turn red. Why do we use red rather than other colors?
As we know, scattering (散射) happens when light goes through the air. For the same media, if the wavelength (波长) is long, the scattering will be short. If the wavelength is short, then the scattering will be long.
Of all light we can see red has the longest wavelength, so the scattering is the weakest. That means the red light travels far. In fact, it travels farther on rainy days.
Using the red light can help drivers in farther areas see the lights. It helps drivers slow down or stop in time. If drivers don’t see the red light until they are close, they may not be able to stop the car in time. An accident may happen. Red can also excite people. We can act more quickly when we see the color red.
In a word, red light helps drivers stop in time and help prevent accidents.
1.______ has the longest wavelength of all light we can see.
A. Red B. Green C. Yellow D. Black
2.Red light travels farther on ______ days.
A. windy B. sunny C. rainy D. cloudy
3.Red can make people act more quickly because ____________.
A. red can make people happier B. the scattering of red is very short
C. the scattering of red is very long D. red can make people more excited
4.The underlined word “prevent” means ______ in Chinese.
A.逃避 B. 防止 C. 处理 D. 检查
5.The passage mainly tells us ____________.
A. why accidents happen B. how the red light travels
C. why we use red traffic lights D. how to stop in time at traffic lights
查看习题详情和答案>>
As we know, scattering(散射) happens when light goes through the air. For the same media(媒质), if the wavelength islong, the scattering will be short. If the wavelength is short, then the scattering will be long.
Of all lights we can see red has the longest wavelength, so the scattering is the weakest. That means the red light travels far. In fact, it travels farther on rainy days.
Using the red light can help drivers in farther areas sec the lights. It helps drivers stow down or stop in lime. If drivers don't see the red light until they are close, they may not be able to stop the car in time. An accident may happen Red can also excite people. We can act more quickly when we see the color red. In a word, red lights help drivers stop in time and help prevent accidents.
【小题1】 When the traffic lights turn ______, we will stop driving a car.
A. red B green C. yellow
【小题2】According to the passage, the scattering of the red light is the _______.
A. longest b. weakest C. farthest
【小题3】 The underlined word "wavelength" means________ in Chinese.
A.波浪 B.光波 C.波长
【小题4】 What can the red light help drivers do?
A. It can help drivers in farther areas see the lights.
b. It can help drivers slow down or stop in time.
C.A and b
【小题5】Which of the following is the best title?
A. Why do accidents happen
b. How does the red light travel
C. Why do we use red traffic lights 查看习题详情和答案>>
根据对话内容，从方框内的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
A: Hi, Sally. How is it going these days ?
B: ( )46.__________.Thank you ,David .But I’m very busy .
A: Why are you so busy ?( ) 47. ___________
B: I’m studying for the coming English exam. You know, I’m not good at it. But your English is so good .( )48.____________
A: Skills? To tell you the truth ,I have no skills. I just read English every day, watch English movies, listen to English songs and try to talk with my friends in English.
B: ( ) 49.____________. You mean I should read more, listen more and speak more, right ?
A: Yes. I think if you learn English like this, you can learn it very well.
B: Thank you so much .
A: You are welcome. ( ) 50.____________
Can you tell me about some skills ?
Not bad.
I hope you can do well in the English exam.
What are you doing ?
But I don’t like English .
I know now .