问题 选择题

下列叙述及相应的原理(用化学方程式表示)及基本反应类型都正确的是(  )

A.一氧化碳在空气中燃烧:2CO+O2═2CO2  化合反应

B.铁在空气中燃烧:3Fe+2O2

 点燃 
.
 
Fe3O4   化合反应

C.氧化汞受热分2HgO

  △  
.
 
2Hg+O2↑    分解反应

D.焦炭与氧化铁反应:3C+2Fe2O3

 高温 
.
 
4Fe+4CO2↑   氧化反应

答案

A、该化学方程式缺乏反应条件,正确的化学方程式应为:2CO+O2

 点燃 
.
 
2CO2

B、铁在空气中不能燃烧,故化学方程式错误.

C、该化学方程式书写完全正确,且该反应符合“一变多”的特征,属于分解反应,故选项正确.

D、该化学方程式书写完全正确,该反应是一种单质和一种化合物反应生成另一种单质和另一种化合物的反应,属于置换反应;氧化反应不是基本的化学反应类型.

故选C.

阅读理解

Victor’s hobby was collecting stamps. He had stamps from many countries, like England, Canada and China. On his birthday, can you guess what people gave him? That’s right---stamps.

Victor’s favourite stamps came from France. He had almost every stamp from 1954 to 2004. He only needed one. That was a 1974 special edition*. It was very hard to find.

He looked for it everywhere. He asked his friends and relatives to help him. But nobody could find the stamp. It made Victor very sad.

“Don’t worry. Never give up,” his father said to him. “If you have enough patience, you’ll find it one day.”

“I hope so,” Victor said.

Victor also liked writing. He had a penfriend in France. They wrote to each other every month. Victor’s penfriend, Phillip, usually used new stamps to send letters. Sometimes, his mother gave him stamps to use. Once Phillip’s mother gave him a big, green stamp. It looked old. When Victor received the letter, he was very surprised. On the envelope, he looked carefully at the stamp. It was the 1974 special edition stamp. Victor was so happy. He told his sister, his mother and his father.                                                   

“ You see,” his father said. “ You did find your stamp. So, it’s good to have two things in life.”

“What are they?” Victor asked.

“ Friends and patience.” He answered.

小题1:It was very difficult for Victor to find a special French stamp of _________.

A.1954

B.1974

C.1994

D.2004小题2:What does the underlined word “patience” mean?

A.勇气

B.知识

C.耐心

D.目标小题3:Who owned the special edition stamp at the very beginning?

A.Phillip.

B.Phillip’s mother.

C.Victor.

D.Victor’s father.小题4:The passage mainly tells us that ________ is(are) important to people.

A.a happy family

B.a good hobby

C.relatives and friendship

D.friends and patience

多项选择题