Air is all around us. It is around us as we talk and play. From the moment we were born, We are surrounded(围绕)by air. When we sit down, it is around us. When we go to bed, air is also around us. Wherever we are on the earth, We are surrounded by air. We live in air.
All living things need air, living things can’t live without air. We can go without food or water for a few days, but we can’t live for more than a few minutes without air. We breathe(呼吸)in air. When we are working or running, We need more air. So we breathe faster than usual. When we are asleep, We need less air.
1.From the text, we know that on the earth _____
A．there is air everywhere
B．some animals don’t need air
C．plants need more air
D．for a long time people don’t need air
2.The writer tells us that _____
A．there is less air on the earth than on the moon
B．the earth is covered with air
C．the earth is covered with water
D．there is no air on the earth
3.Which is the first important thing for people’s lives?
A．Water B．Air C．Food D．Sunlight
4.Which of the following things needs air?
A．Land B．A mirror C．A cat D．A river
5.A man needs more air when he _____
A．dies B．runs fast C．takes a rest D．sleeps
Water can be a liquid, a solid or a gas. When it is a solid, it can be as hard as stone. When it is a liquid, it can run through your fingers. When it is a gas, you may not see or feel it.
Water can change from a solid to a liquid or to a gas easily. This is why we always have fresh water. Now let us find out how it does. The heat of the sun turns liquid water into gas from the oceans, seas, rivers and lakes. The heat also turns liquid water into gas from the ground, the plants and the animals. Water in the gas rises and turns into clouds in the air.
When the clouds come near a mountain, they rise high. As the clouds rise, they get cooler. The higher they rise, the cooler they become. Then more and more water gas turn into water drops. In this way, the drops of water in the clouds get bigger and bigger. Then they fall to the earth as rain.
根据短文内容，选择正确答案
1.What is the solid of water?
A．Rain B．Gas C．Stone D．Ice
2.When the water is a _____, we may not see or feel it.
A．liquid B．soild C．gas D．snow
3.The water in the oceans turns into clouds because _____
A．the wind B．the heat of the sun
C．the mountain D．the earth
4.According to the passage, it rains most over the_____
A．seas B．oceans C．mountains D．farms
5.The higher you go up the mountain, _____you will feel.
A．the cooler B．the hotter C．the heavier D．the bigger
We know 1 about the universe(宇宙). It means the earth, the sun, the moon, the stars, and the space 2 them.
Most of the stars are much 3 than the moon, but they look smaller 4 they are far away from the earth. At night, the moon is high in the sky 5 a light. But the moon has 6 light of its own. The light of the moon comes from the sun. The sun gives us light, heat and life. And the plants, animals and men will die 7 the sun.
The earth goes around itself 8 . When the part of the earth 9 to the sun, it is day. The 10 part of the earth is night.
The earth is our homeland. We should love it.
1. A．many B．a lot of C．much D．few
2. A．in B．between C．among D．with
3. A．farther B．nearer C．warmer D．bigger
4. A．because B．so C．but D．and
5. A．looks B．like C．looks like D．as
6. A．not B．no C．little D．less
7. A．with B．without C．in D．on
8. A．a long time B．in the daytime C．all the time D．take after time
9. A．turns B．gets C．points D．changes
10. A．front B．following C．opposite D．same
Manual always talks but does . so everyone likes him.
A. few, little B little, much C. less, more D. more, less
The thief the purse and .
A．drops, run after B．droped, ran away
C．dropped, run away D．dropped, ran away
Do you know ?
A．what he happened B．what the matter is with him.
C．what happened to him D．what did he happened
