问题 填空题

“绿色奥运、科技奥运、人文奥运”是北京奥运会    的三大理念。

(1)北京奥运会游泳馆“水立方”内部材料主要由金属材料钢铁构成,外部材料聚氟乙烯属于__________材料(填“合成”或“天然”)。        

为确保“水立方”的水质达到国际泳联最新卫生标准,泳池的水将采用“砂滤- 臭氧一活性炭”净水工艺,其中砂滤的作用是__________,使用活性炭是利用它的__________性。“水立方”还设计了循环用水、收集应用雨水等系统,达到了节水目的。    

(2)火炬的外壳用铝合金制作。其原因是铝在空气中易氧化而形成一层致密的氧化膜,保护铝制品不被继续腐蚀。有关化学方程式是______________________________,同时外形材料为可循环使用的环保材料,能回收利用。下列图标中属于物质回收标志的是    __________(填编号)。     

A.                

B.                

C.                

D.

答案

(1)合成 ;过滤 ; 吸附  

(2) 4Al+3O2=2Al2O3 ;B

选择题
阅读理解

阅读理解。

     Scientists have always wanted to know more about the universe.

     Years ago they knew many things about the moon. They knew how big it was and how far away it was

from the earth. But they wanted to know more about it. They thought the best way was to send men to the

moon.

     The moon is about 384,000 kilometers away from the earth. A plane cannot fly to the moon because the

air reaches only 240 kilometers'away from the earth. But something can fly even where there is no air. That

is a rocket.

     How does a rocket fly? There is gas in the rocket. When the gas is made very hot inside the rocket, it will

rush out of the rocket, pushing the rocket up into the sky. Rockets can fly far out into space. Rockets with

men in them have been to the moon. Several rockets without men in them have flown to another planet much

farther away than the moon. One day rockets may be able to go to any place in space. 

1. What did scientists know about the moon years ago? [ ]

A. The size of the moon.

B. The distance between the earth and the moon.

C. Life on the moon.

D. Both A and B.

2. A plane cannot fly to the moon because _____. [ ]

A. its engine is not powerful enough

B. it cannot fly so high

C. there is no air on the moon

D. the moon is too far away from the earth

3. A rocket is driven by _____. [ ]

A. electricity

B. hot gas inside it

C. atomic energy

D. energy from sunlight

4. Which of the following is NOT true? [ ]

A. Rockets can fly into outer space.

B. Rockets have flown to most of the planets so far.

C. Rockets with men cost more than rockets without men.

D. Rockets without men appeared earlier than rockets with men.

5. Choose the best title for this passage? [ ]

A. The Moon and Planets.

B. Flying to the Moon.

C. How Does a Rocket Fly?

D. Rockets in the Universe.