问题 选择题

下列各实验操作正确的是(  )

A.

  点燃酒精灯

B.

 氧气验满

C.

  液体加热

D.

 量9.5ml液体

答案

A、点燃酒精灯要用火柴点燃,不能用点燃的酒精灯引燃,否则容易发生火灾,故A错;

B、氧气验满的方法:将带火星的木条放在集气瓶口,如果复燃说明满了,故B错;

C、给试管内液体加热时,试管内液体量不能超过试管容积的

1
3
,试管与水平面呈45度角,用外焰加热,试管夹夹在试管的中上部,故C正确;

D、选取量筒时,要选取比量取的液体体积大,且最接近的,所以用10mL量筒量取9.5mL液体,故D错.

故选C.

阅读理解

To many Americans,Labor Day marks the end of the summer,a day off from work and school,and one last chance to relax.But Labor Day is much more than just a day off . It represents a very important victory for laborers everywhere.The holiday is a celebration of the social and economic achievements of American workers.

More than a century ago,workers were forced to deal with harsh conditions.They were paid very little, and they often worked 10-to l2-hour days.Men, women and even small children were forced to work even when they were sick.Tired of long hours and dangerous conditions,workers began organizing themselves into labor unions.On top of fighting for higher pay and shorter workdays,they also fought for the rights of children.The workers wanted employers to place limits on the age of their workers so that small children were not overworked or hurt in factories.

A New York City carpenter named Peter McGuire is credited for coming up with the idea for Labor Day.In 1872,after working many hours under poor conditions, McGuire rallied 100,000 workers to go on strike.The workers marched through the streets of New York City,demanding a better work environment.McGuire spent a decade fighting for workers’ rights.In 1882,he proposed the idea to create a special holiday for workers.On Tuesday,September 5,1882.more than 10,000 workers hit the streets of New York City for the first ever Labor Day parade.Two years later the celebration was moved to the first Monday in September.And in 1894,Congress passed a law making Labor Day a national holiday.

Americans celebrated the first Labor Day holiday with a parade,picnics and fireworks.Today,many people hit the road to enjoy the last of their summer vacation.Others enjoy the long weekend with picnics,backyard barbecues or just rest and relaxation.However you spend Labor Day,remember that the holiday is a time to pay tribute (致敬)to the workers who have made America what it is today.

小题1:What do we know from Paragraph 1 ?

A.Americans have more than a day off on Labor Day.

B.Many countries in the world celebrate Labor Day.

C.Labor Day has a deep meaning for American laborers.

D.Labor Day shows the social and economic power of America.小题2:What is Paragraph 2 mainly about?

A.American workers’ fighting against their employers.

B.The bad life that American workers 1ed.

C.How American employers treated their workers.

D.The life that American workers ever expected.小题3:The underlined word “rallied” in Paragraph 3 can be replaced by“___________”.

A.persuaded

B.supported

C.rewarded

D.gathered小题4:Which of the following statements is TRUE according to the passage?

A.There were about 100,000 workers in New York City in 1872.

B.Labor Day became a national holiday in 1884.

C.In 1872 Labor Day was first put forward by McGuire.

D.The first ever Labor Day parade was held in 1882.小题5:According to the author,while spending Labor Day,Americans should feel _________ .

A.surprised

B.thankful

C.dissatisfied

D.superior

单项选择题