问题 阅读理解

阅读理解。

     Zheng He, the Columbus of the East, was an amazing man.

     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.

1. Why did the Chinese King want Zheng He to sail to many different countries?

A. To bring new countries under the control of China.

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.

2. What do we know about Zheng He from the passage?

A. He sailed to all seven continents.

B. Each of his trips lasted one year.

C. He died at the age of 62.

D. He was a successful businessman.

3. Which of the following did Zheng He NOT bring with him from China?

A. Medicine.

B. Gold.

C. Animals.

D. Silk.

4. What happened after Zheng He died?

A. He was forgotten for ever.

B. His ships were all burned.

C. The new king wrote a book about him.

D. Sea trips to other countries were stopped.

5. In what order did the following happen?

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.

A. e, b, a, f, d, c

B. b, a, e, d, c, f

C. f, a, b, d, c, e

D. b, a, f, e, d, c

答案

1-5       BCBDD

实验题

草酸(乙二酸)可作还原剂和沉淀剂,用于金属除锈、织物漂白和稀土生产。一种制备草酸(含2个结晶水)的工艺流程如右:

回答下列问题:

(1)CO和NaOH在一定条件下合成甲酸钠、甲酸钠加热脱氢的化学反应方程式分别为:                                                                       

(2)该制备工艺中有两次过滤操作,过滤操作①的滤液是           ,滤渣是        ;过滤操作②的滤液是_                       ,滤渣是            

(3)工艺过程中③和④的目的是                                                  

(4)有人建议甲酸钠脱氢后直接用硫酸酸化制备草酸。该方案的缺点是产品不纯,其中含有的杂质主要是                                       

(5)结晶水合草酸成品的纯度用高锰酸钾法测定。

称量草酸成品0.250 g溶于水,用0.0500 mol·L-1的酸性KMnO4溶液滴定,至浅粉红色不消褪,消耗KMnO4溶液15.00 mL,反应的离子方程式为                                        

列式计算该成品的纯度                                                            

单项选择题