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3.如果你遇到生词：
It has
We cannot…but…
see
no shape
no smell
no taste
no colour
feel
... is important to...
people
animals
plants
We all need it to keep us alive.
kite
balloon
plane
It keeps them high in the sky.
What is it?
It has no colour or shape.
It has no smell or taste.
We cannot see it,but we can feel it.
It is everywhere.
It is important to all people.
It is also important to animals and plants.
We all need it to keep us alive.
Look at the kite and the balloon.
Look at the plane and the bird.
They all need it too.
It keeps them high in the sky.