问题 填空题

(5分)能源、环境与人类的生活和社会发展密切相关。

(1)目前,人类以化石燃料为主要能源,常见的化石燃料包括煤、石油和                

(2)为减少污染、提高煤的利用率,可将其转化为可燃性气体,此过程可认为是碳与水在高温下的反应,其微观示意图如图所示:该反应的化学方程式为              ,基本反应类型为         

(3)燃气安全是家庭生活中的头等大事,为了防止燃气泄漏,常在燃气中加入少量有特殊气味的乙硫醇(C2H5SH)。一旦燃气泄漏即可闻到气味,从微观的角度分析其原因是                        ;乙硫醇充分燃烧时生成二氧化碳、二氧化硫和水,乙硫醇燃烧的化学方程式为                 

答案

(1)天然气  (2)C+H2OCO+H2;置换反应

(3)分子在不断运动;2C2H5SH+9O24CO2+2SO2+6H2O

题目分析:(1)化石燃料包括煤、石油、天然气;

(2)根据图示可知,此反应是:C+H2OCO+H2,此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;

(3)由于分子是不断运动的,一旦燃气泄漏时,燃气中的乙硫醇分子通过运动分散到空气中,所以,能闻到气味;乙硫醇充分燃烧时生成CO2、SO2和水,燃烧化学方程式为2C2H5SH+9O24CO2+2SO2+6H2O。

阅读理解

American schools do not have separate classes for boys and girls. If boys want to cook or to sew, they can learn these things in classes that are no longer just for girls. If girls want to repair cars, they can now learn this in school. Most students like to have boys and girls on the same baseball team.

Many boys and girls dress alike in school. They were blue jeans and sport shirts. Some have long hair and some have short hair. Sometimes a boy has longer hair than a girl.

Even the language is different. Students learn to say fire fighter instead of fireman, police officer instead of policeman, and letter carrier instead of mailman. A person does not need to be a man to fight a fire or to deliver the mail.

Most people think that these changes are good. They give all people an equal chance to be happy and to do what they want to do with their lives. Fathers like to tell their sons that they can grow up to be president. Today, mothers can tell the same things to there daughters.

小题1:Students in American schools learn to say police officer instead of policeman because____.

A.boys don’t like to be a policeman

B.girls don’t like to be a policeman

C.police officer sounds better than policeman

D.a police officer can be a policeman or policwoman小题2: We may infer from the text that in the past in American schools____.

A.there were many differences between boys and girls

B.boys could do everything but girls couldn’t

C.boys and girls were the same in everything

D.girls only learned how to sew and cook小题3:The underlined word “ They” in the last paragraph refers to ____.

A.American schools

B.these changes

C.most people

D.American students小题4:What does “mailman” mean?

A.Milkman

B.Postman

C.Writer

D.Reporter小题5:What do most people think of the changes in American schools?

A.Surprising

B.Strange

C.Good

D.Bad

单项选择题