问题 问答题

根据如图自编一道计算题并给出标准答案.[C-12Cl-35.5Ca-40O-16H-1](原来总是老师出题考我,现在我也当一回老师,并能做出标准答案^_^)

答案

根据题给的信息结合所学知识可以知道,题中石灰石可以和稀盐酸反应生成二氧化碳,所以根据该反应可以编制题目为:足量的盐酸跟200g含碳酸钙80%石灰石完全反应,可生成二氧化碳气体多少克?

200g石灰石中含碳酸钙的质量为:200g×80%=160g

设可以生成二氧化碳气体的质量为x,则:

CaCO3+2HCl═CaCl2+H2O+CO2

100 44

160g x

100
160g
=
44
x

解得:x=70.4g

答:可生成二氧化碳气体70.4克.

阅读理解

When 7-year-old Warren Buffet said “ I will be the richest man one day”, his friends made fun of his “daydreaming”. But ever since then the little boy has set about learning how to make money, selling drinks, delivering newspapers and buying stocks. He had already earned $ 9,000 ( equal to $ 90,000 today) by the time he graduated from high school and became a millionaire at 32.

And this month the 77-year- old, who earned his fortune by making a lot of great investment in the stock market, made his childhood dream come true. With a fortune of $ 62billion, Buffet has risen to be the world’s richest man according to Forbes Magazine.

Born in 1930, Buffet, the only son of a stockbroker, started on achieving his billion-dollar dream at an early age and was always ready to think outside the box to develop his business. At 8 he went to golf courses collecting and selling used balls.

At 11 when he sold soda pop door to door with a friend, the pair collected lids on the streets to judge which flavor was the most popular.

As a paper boy during high school, Buffet delivered two rival (竞争对手的)papers, so that even when customers canceled one of the subscriptions, he could still make a profit from the other. With his paper delivery savings, Buffet bought 162,000 square meters of farmland and collect rent.

Young Buffet stepped into the stock market at 11 but earned only $ 5. The experience taught him one of the virtues (品质) in investing: patience.

After graduating from university, Buffet started his venture with stocks with his childhood earnings and money from friends. He researched the stocks and just bought those of solid companies that were undervalued and inexpensive at the time. By sticking to companies such as American Express and Coca-cola, Buffet has become rich.

“Learning is important to Buffet’s success. He is a learning machine who can spend his entire day reading. He keeps learning, from books, street smarts and investigation, from both success and failure. In this way, he finally over achieved his aptitude ( 才能) ,” said Charlie Munger, his long-time business partner.

小题1:Which of the following questions has NOT been discussed in the selection?

A.What is Buffet’s approach to investing.

B.How do other people view Buffet.

C.How has Buffet handled hardships in his life.

D.How did Buffet make a fortune and realize his dream.小题2:With the example of delivering two rival papers in high school, the author intends to tell us that Buffet______.

A.had a good sense of business

B.was a good paper boy

C.was hard to deal with business

D.knew anything but how to make money小题3:. What did Buffet learn from his early experience of investing in stock market?

A.You never stop learning.

B.Be patient in business.

C.Only buy stocks of solid companies that are undervalued and inexpensive.

D.Stick to buying stocks in companies such as American Express and Coca-cola.小题4:. Which of the following can most probably serve as the title of the selection?

A.Buffet – Good Example for All

B.Buffet- a Newspaper Boy

C.Buffet- Investor in Stock Market

D.Buffet- a Successful Daydreamer

单项选择题