阅读短文，然后根据其内容回答所提问题。
Air

Air has no smell.
Air has no taste.
But when the wind blows,
You feel it on your face.

Look at a kite,
Or a plane in the air.
How do they stay there?
They ride on air.

How does a balloon
Rise in the air,
And lift people up?
It uses hot air.
We need air to breathe.
We need air to survive.
And when we breathe it,
It keeps us alive.
【小题1】What is the passage above?
____________________
【小题2】When can we feel the air?
____________________
【小题3】How does a balloon lift people up?
____________________
【小题4】Can we live without the air?
____________________