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