问题 选择题

以下不利于教室内空气清洁新鲜的做法是(  )

A.经常开窗,保持空气流动

B.绿化校园的环境

C.勤打扫教室,保持清洁

D.关闭门窗,防止灰尘飞入

答案

A、经常开窗通风,保持空气流动,可使教室内的空气保持清新,利于呼吸.故不符合题意.

B、绿色植物可以吸收大气中的有害气体;可以阻滞和吸附大气中的粉尘和放射性污染物;能够分泌抗生素,杀灭空气中的病原菌.所以绿化校园的环境,可以起到保持空气清新的作用.故不符合题意.

C、教室内由于学生较多,呼吸产生的二氧化碳以及粉笔末、灰尘等都威胁着学生的身体健康.因此勤打扫教室,保持清洁可以使教室内的空气保持清洁新鲜.故不符合题意.

D、关闭门窗,外界的新鲜空气无法进入,教室内的一些有害气体或是粉尘无法散发到室外,会影响教室内的空气质量.故符合题意.

故选:D

判断题
阅读理解

From the beginning of human history, wild animals provided food, clothing and sometimes medicine. We may not depend as much on wild animals now. But we hear about them every day. Americans use the names of animals in many ways. Automobile manufacturers(制造商) and gasoline companies especially like to use big cats to sell their products. They like lions, tigers and wildcats. When Americans say wildcat, they usually mean a lynx, an ocelot or a bobcat. All these cats attack quickly and fiercely. So wildcats represent something fast and fierce.

An early American use of the word wildcat was quite different. It was used to describe members of Congress(国会) who declared war on Britain in 1812. A magazine of that year said the wildcat congressmen went home. It said they were unable to face the responsibility of having involved their country in an unnecessary war.

Wildcat also has been used as a name for money in the 1800s. At that time, some states permitted banks to make their own money. One bank in the state of Michigan offered paper money with a picture of a wildcat on it. Some banks, however, did not have enough gold to support all the paper money they offered. So the money had little or no value. It was called a wildcat bill or a wildcat bank note. The banks who offered this money were called wildcat banks. A newspaper of the time said those were the days of wildcat money. It said a man might be rich in the morning and poor by night.

Wildcat then was also used for an oil well or gold mine that had almost no oil or gold in it. Dishonest developers would buy such property. Then they would sell it and leave town with the money. The buyers were left with worthless holes in the ground. Today, wildcat oil wells are in areas that are not known to have oil.

小题1: What is the main idea of the passage?

A.Wildcats and their stories.

B.Wildcats and their characters

C.Varieties of animal species.

D.Relationship between animal and humans.小题2:From the passage we can know that______.

A.wildcats represent the state of Michigan

B.the use of wildcat was not always the same

C.wildcats are the best friend of human beings

D.honest developers never buy wildcat oil wells小题3: The underlines words “a lynx, an ocelot or a bobcat” in Paragraph 1 may refer to “      ”.

A. gasoline companies                    B. automobile manufacturers

C. names of wildcats                     D. brands of automobile

64. Which of the following would people like to have or trust according to the passage?

A. Wildcat congressmen.                  B. Wildcat oil wells.

C. Wildcat banks.                        D. Wildcat cars.

小题4: It can be inferred that during the days of wildcat money_________.

A.people couldn’t buy anything with the money

B.people didn’t know how to save money.

C.the rich invested too much on oil wells.

D.people complained and suffered a lot