问题 填空题

(4分)小亮将点燃的蜡烛置于一个倒扣的烧杯中,发现:①蜡烛火焰逐渐黯淡变小;

②将烧杯拿起后,蜡烛火焰重新变明亮;③烧杯底部出现一层黑色物质;④将燃烧的蜡烛浸没于水中,蜡烛熄灭。小亮由此得出几条火灾逃生的方法,请将能作为依据的上述实验现象的相应序号填入以下的相应方法之后。

A.逃生时应用湿抹布捂住口鼻。_________________

B.室内起火时,不可立即打开门窗排烟。___________________

C.逃生时碰到有烟雾的地方应蹲下或匍匐前进。_________________

D.可将身上衣服用水淋湿后逃生。________________

答案

(4分,每空各1分)

A.③      B.②      C.③      D.④

A、逃生时应用湿抹布捂住口鼻,是因为烧杯底部出现一层黑色物质,说明火灾发生时会产生大量有毒气体.

B、室内起火时,不可立即打开门窗排烟,是因为氧气充足使燃烧会更旺盛.

C、逃生时碰到有烟雾的地方应蹲下或匍匐前进,是因为烧杯底部出现一层黑色物质,说明火灾发生时会产生大量有毒气体,烟雾和有毒气体能随热气流上升,蹲下或匍匐前进能防止吸入烟雾.

D、可将身上衣服用水淋湿后逃生,是因为衣服湿了,不易燃烧,保护人体不受伤害.

故答案为:A.③B.②C.③D.④.

阅读理解

Obama Still Smokes in Secret

US President Barack Obama has just made life more difficult for cigarette makers. He has just signed a law that will set tough new rules for the tobacco industry. The new law gives the US Food and Drug Administration the power to strictly limit the making and marketing of tobacco products.

At a White House signing ceremony Monday, Obama said that he was among the nearly 90% of smokers who took up the habit before their 18 th birthday.

Obama, who has publicly struggled to give up smoking, said he still hadn’t completely kicked the habit. Every now and then he still smokes in secret.

“As a former smoker I struggle with it all the time. Do I still smoke sometimes? Yes. Am I a daily smoker, a constant smoker? No.” Obama said at a news conference.

“I don' t do it in front of my lads.I don ?t do it in front of my family.I would say that I am 95% cured, but there are times when I mess up, " he said.

"Once you go down this path, it' s something you continually struggle with, which is exactly why the law is so important.The new law is not about me, it' s about the next generation of kids coming up.What we don ' t want is kids going down that path," he said.

Nearly 20% of Americans smoke and tobacco use kills about 440,000 people a year in the United States due to cancer, heart disease, and other serious diseases.

小题1:The new law makes life difficult for             .

A.Obama

B.tobacco industry

C.White House

D.US Food and Drug Administration小题2:What do we know about Obama?

A.He no longer smokes.

B.He still smokes as usual.

C.He began to smoke at eighteen.

D.He is trying hard to give up smoking.小题3:According to the passage, Obama is most concerned about           

A.children

B.officials

C.his family

D.Businessmen

问答题 简答题