题目内容：

Once, there was a little grey planet. People living on it hadn’t looked after it well. Although they had all kinds of inventions and spaceships beyond our imagination, they made the planet full of rubbish and pollution. As a result, there were no plants or animals left.

One day, a little boy was walking on the planet. When he passed a cave(山洞), he noticed a small red flower in it. The flower was sick. It was almost dying. The boy dug it out carefully with root and some soil. Then he tried to find somewhere to plant it. After he searched all the planet, there is no proper place because of rubbish and pollution. He looked up in the sky and he found the moon. He thought the flower might grow well on the moon. So he climbed into a spaceship with the flower and flew to the moon. He grew the flower on the moon and looked after it every day. The flower started to grow so well that several days later it gave birth to many little flowers. Soon these flowers spread all over the moon and the moon was covered with red flowers.

When the flowers open, the moon looks red, like a warning light. If we don’t look after our earth, the day will come when flowers will only be able to grow on the moon.

根据短文内容，选择最佳答案。

1.Why there were no plants or animals left on the grey planet?

A. Because of rubbish and pollution.

B. Because there is no water.

C. Because it’s too hot.

2.What did the boy find in the cave?

A. A yellow flower.

B. A red dying flower.

C. A little dog.

3.How was the flower after it was planted on the moon?

A. It couldn’t grow and died.

B. It grew well and gave birth to many little flowers.

C. It didn’t grow well and the leaves turned yellow.

4.Why does the moon look red according to the passage?

A. Because it is covered with fire.

B. Because it is covered with red water.

C. Because it is covered with the red flowers.

5.Which of the following is TRUE?

A. The color of the planet is red.

B. The boy went to the moon by plane.

C. The planet is covered with rubbish and pollution.