In the sea there are many islands. In its warm waters there are some little ones. We call them coral(珊瑚) islands.
A coral island is very nice to look at. It looks like a ring of land with trees, grass, and flowers on it. One part of the ring is open to the water. There is a little round lake inside the island.
If you look into this lake, you will see beautiful coral. You may think they are flowers.
If you look at a piece of coral, you will see many little holes in it. In each of these holes a very small sea animal has lived. These sea animals make the coral.
They began to build under the water. Year after year, the coral grew higher and higher. At last it grew out of the water.
Then the sea brought to it small trees and something else. After some years, these things changed into earth. Sometimes the wind brought seeds to this earth. Sometimes birds flew over it and brought seeds to the island. The little seeds grew. In a few years there were plants all over the island. In a few more years there were trees growing there.
So you see, these islands were built little by little. The workers were very small. Don’t they teach us a lesson? Can you think what the lesson is?
In the sea _____.

A．there are no coral islands	B．there are some coral islands
C．the water is always warm	D．we can see many flowers and fishes

A coral island looks like ______.

A．a round cake

B．trees, grass and flowers

C．a ring of land

D．a round lake

There are ____ in the holes in corals.

A．flowers

B．little corals

C．grass

D．sea animals

How did seeds of trees, grass and flowers come to the coral islands?

A．The wind and birds brought them to the coral islands.

B．Only the wind brought them there.

C．People brought them there.

D．Fishes brought them there.

From the story we learn that _____.

A．small workers can’t do big things

B．only big workers can do big things

C．small workers can do big things if they work hard and work a long time

D．all small things can do things