问题 问答题

随着“西气东输”的全线贯通,今年8月底我省将有10万户用上天然气.作为家庭成员,我愿将下列有关天然气的化学知识告知父母:

(1)天然气的主要成分是______,其燃烧的化学方程式为______

(2)天然气在第一次通过管道输送到用户时,必须先将管道内注满氮气.我知道填充氮气的目的是______.

(3)天然气本身是一种无色无味的气体,但在使用时常在天然气中加入少量有特殊气味的乙硫醇.加入乙硫醇的作用是______.

答案

(1)天然气的主要成分是甲烷,能在点燃的条件下生成二氧化碳和水.

故答案为:甲烷或CH4;CH4+2O2

 点燃 
.
 
CO2+2H2O.

(2)任何可燃性气体与空气混合点燃时都有可能发生爆炸,氮气的化学性质不活泼,起到排尽管道内的空气,用作保护气的作用.

故答案为:排尽管道内的空气,防止甲烷与空气混合点火时发生爆炸.

(3)天然气本身是一种无色、无味的气体,泄漏时难于察觉.

故答案为:提醒人们及早发现天然气泄漏,防止爆炸事故的发生.

阅读理解

A group of teenagers: they laugh and talk over each other, dance and make faces — you wouldn’t believe they had just played on the same stage as famous American singers Kid Cudi and Eminem.

These seven kids, all under the age of 20, are members of the band Kids These Days (KTD).

Fresh out of high school, the band already has done things that most teens couldn’t even imagine. They played at festivals including the recent SXSW in Austin and Lollapalooza in their hometown, Chicago, to crowds of loyal fans.

KTD uses a mix of hip-hop, jazz, blues and classic rock to make a sound of their own.

“KTD simply mixes most, if not all of my favourite music styles,” said Kamia Jones, as Chicago high school student.“I like that they aren’t afraid to be different and that their music is real and speaks to the soul.”

The band formed two years ago. Now, as well as local fans, they are becoming popular around the world. Their facebook page is filled with supportive posts from admirers from California to Tokyo.

“It’s really strange to me that people from London, Australia and Russia... They have heard

of us and they like our music because it’s really cool feeling,” says Marcie Stewart, who plays keyboard for the band.

Despite their recent fame, KTD is a group of normal teenagers and they remain very close to one another. While talking to the reporters, they dance and make fun of each other.

When asked what advice they would give to other teen musicians, Greg Landfair, KTD’s drummer, said, “Keep your heart in it. Never lose the music and what you are doing, because that’s what you’re here for. Let the music always be first.”

小题1:KTD’s music is popular among teenagers mainly because ________.

A.it is about the strange life of teenagers

B.it mixes many music styles teenagers love into their music

C.all the band members are young and handsome

D.the band members dance and make fun of each other小题2:What do we know about KTD?

A.They are all of the same age.

B.They are as famous as Kid Cudi and Eminem.

C.There are five members in the band.

D.They have fans around the world.小题3:According to Greg, teen musicians should___________.

A.make music close to their lives

B.always think of the needs of the fans

C.love the music they are playing

D.stay close to the group member小题4:The author wrote this article to___________.

A.show the kind of music teenagers love

B.encourage young musicians to play music

C.describe a special music style

D.introduce a successful band of teenagers

问答题 简答题