问题 选择题

毒品严重危害人类社会.冰毒的化学式为C10H15N,有关冰毒的叙述正确的是(  )

A.不完全燃烧时会生成CO

B.完全燃烧时的生成物只有两种

C.C,H,N元素的质量比为10:15:1

D.C,H,N三种元素中质量分数最高的是氢元素

答案

A、根据燃烧的规律,冰毒中的C元素在不完全燃烧时会生成CO,故A正确;

B、根据燃烧的规律及冰毒的化学式为C10H15N,可推断其完全燃烧时的生成物为二氧化碳、水及氮的氯化物三种物质;故B不正确;

C、冰毒中的C、H、N元素的质量比=(12×10):(1×15):14=120:15:14≠10:15:1;故C不正确;

D、由冰毒中的C、H、N元素的质量比为120:15:14可得其中元素质量分数最高的为碳元素而非氢元素;故D不正确;

故选A.

阅读理解

Lang Lang, the young Chinese pianist, was born in Shenyang in 1982. He began to play the piano when he was 3. At the age of 5, he won first place in a piano competition in Shenyang. People thought he was a genius(天才). From then on, playing the piano became the dream of Lang and his parents.

When Lang was 9 years old, he and his father went to Beijing to study piano. His father even left his work. Although he endured(忍受) great pressure(压力), Lang never gave up his dream of becoming a concert pianist. When he was 17, Lang became famous after he played in a great concert in Chicago, US.

Now 28-year-old Lang is famous all over the world for his great performances. He played at the Beijing Olympics in 2008. He was also one of Times magazine’s 100 Most Influential(有影响力的) People in the World in 2009. He is one of the world’s great musicians.

小题1:What does Lang Lang do?

A.He is a violinist.

B.He is a pianist.

C.He is a music teacher.

D.He is an engineer.小题2:When did Lang Lang win first place in a piano competition in Shenyang?

A.In 1982.

B.In 1985.

C.In 1987.

D.In 1991.小题3:Why did Lang Lang’s father leave his work?

A.Because he wanted to find a job in Beijing.

B.Because he wanted to learn the piano.

C.Because he could find better jobs in Shenyang.

D.Because Lang Lang went to Beijing to study piano and he wanted to give much help.小题4:Which is NOT true according to the passage?

A.Lang Lang works very hard at piano.

B.Lang Lang wasn’t famous before 2009.

C.Lang Lang was born in Liaoning Province.

D.Lang Lang played at the Beijing Olympics in 2008.

单项选择题