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 ,air is also around us ,we live in air .
All living things need air:living things cann’t live without air.
We can go without food or water for a few days ,but we can not live for more than a few minutes without air. When we are working or running ,we need some air. So we breathe faster than usual. When we are asleep, we need less air.
小题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.小题2:The writer tells us that _____.
A．there is less air on the earth than on the moon.
B．the earth is covered with water
C．the earth is covered with air
D．there is no air on the earth.小题3:Which of the following things need air ?
A．land
B．A mziror
C．A cat
D．A river.小题4:Which of the flooowing is the first important thing for people’s lives ?
A．water
B．air
C．food
D．sunlight .小题5:A man needs more air when he _____.
A．dies
B．runs fast
C．takes a rest
D．sleeps
