问题 填空题

某人带领猎犬举着火把进人人迹罕见的山洞里,不久猎犬死亡,当人蹲下察看时,火把熄灭,人也感到头晕气喘,于是赶紧站起跑出.根据此事实回答:

(1)猎犬死亡是因为______.

(2)火把熄灭说明______.

答案

根据教材中学习的有关二氧化碳的物理性质:密度比空气大;二氧化碳的化学性质:二氧化碳不能供给呼吸;二氧化碳不支持燃烧;我们就可以回答此题.

故答案为:(1)二氧化碳的密度比空气的密度大,洞内CO2的含量高且不能供给呼吸

(2)CO2不燃烧,一般也不支持燃烧;

阅读理解

阅读理解。

SHANGHAI- Today there are more than 350 , 000 people visiting the Expo(世博会). The French

pavilion(场馆) is still the hottest. Over 3,000 people are waiting in line in front of it. The organizers suggest visitors go to other pavilions first. In fact, pavilions of countries such as Russia,Canada,Japan and America are all very good.

XI'AN-Today more than 2,000 people have written their names on a paper. They promise to use less

energy and live a low-carbon(低碳) life. Let's follow them. Cut off the power of your computer when you don't use it. Turn off the lights when going out. Use buses more. Share your cars with others. Eat less meat. Let's do our best to stop the earth from warming.

ANKANG- A taxi driver found a bag in his car this morning. There was 10,000 yuan in it.The  

kind-hearted driver gave the bag to the police. The police have now found the owner, a businessman from Baoji.To show his thanks, the owner wanted to give him 500 yuan ,but the driver didn't take it. He says it

is something that any taxi driver will do.

XINING-A special train is now leaving Xining for Shanghai.It carries the last 300 Tibetan children.The

platform is crowded with people. Most of them are parents. These children will study in some famous

schools in Shanghai until they finish high school. Those schools will pay all their expenses(费用).The

children will also get 100 yuan as pocket money each month. Many parents ask us to give their thanks

to the Party.

1.It is clear that people are more interested in the ______pavilion.

A. French    

B. Russian    

C. Canadian  

D. Japanese

2.Which of the following is a way of low-carbon life?______.

A. Never turn off your computer.

B. Always keep the lights on.

C. Always drive to work.

D. Eat less meat.

3.The headline(标题)of the third news should be ______.

A. A Good Policeman

B. An Honest Taxi Driver

C. A Careless Businessman

D. A Kind Reporter

4.The fourth news says that _____________.

A.the children will get 100 yuan from their parents each month

B.there are only parents at the station

C. all the children will go to the same school

D. the parents are very thankful

5.Which of the following is TRUE according to the news?________.     

A.The American pavilion is the most popular.

B. The readers are asked not to share their cars with others.

C. The government takes good care of the Tibetan children.

D. The taxi driver took the 500 yuan.

单项选择题