问题 问答题

汽车尾气排放出的气体主要有NO 和NO2,它们污染环境,可用氨气(NH3 ) 除去.反应的化学方程式为:2NH3+NO+NO2

 催化剂 
.
 
2N2+3H2O.若反应后得到56g N2,理论上消耗氨气多少克?

答案

设消耗氨气的质量为x

2NH3+NO+NO2

 催化剂 
.
 
2N2+3H2O

 34                 56

 X                  56克

34
x
=
56
56克

解之得:x=34g

答:消耗氨气的质量为34克.

阅读理解

阅读理解。

     Yao Ming was born in China in 1980. In his last season with the Shanghai Sharks, he scored 32.4 points

per game. Now the big man from China is helping the Houston Rockets in the NBA. He is the son of two

great basketball players and learnt how to play basketball when he was young. Now, as one of the stars in the

NBA, he is working hard to make his dream come true and show the world that Chinese basketball players

love this game too!  

     Pele was a football player that everyone knew. He was born in Brazil (巴西) in 1940. He started playing

for Santos when he was only 16 and he didn't retire (退役) until 1977. He played for Brazil 111 times and he

scored 97 international goals. Pele came from a poor family. He started playing football in the street, like many

people around the world do. He was soon picked to play for Santos and quickly became an international person.

     Steffi Graf was born in Germany in 1969. She won the tennis semi-final (半决赛) at Wimbledon in 1985

when she was only 16, but she lost the final to another great tennis player, Martina Navratilova. People were

surprised by the strength and power of her game. She soon became a famous tennis player and she has won

most of the main matches several times.

1. In the passage, ______ is the youngest player.

A. Pele

B. Yao Ming

C. Steffi Graf

D. Martina Navratilova

2. ______ comes from the South America and is very famous all over the world.

A. Pele

B. Yao Ming

C. Steffi Graf

D. No one

3. In which year did Pele start playing for Santos?

A. In 1940

B. In 1956

C. In 1969

C. In 1977

4. From the passage, we know that ______.

A. Steffi Graf was born in Wimbledon in 1985

B. Steffi Graf won the tennis final when she was only 16

C. Martina Navratilova was also a tennis player

D. Steffi Graf has won few of the tennis players

5. Which of the following is NOT true?

A. Yao Ming is on the Houston Rockets now.

B. Pele became famous soon after he was picked to play for Santos.

C. Steffi Graf was a famous tennis player.

D. Martina Navratilova lost the tennis final at Wimbledon in 1985.

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