阅读短文，根据其内容，从A、B、C、D中选出最佳答案。
In space, there was a little gray planet. It looked very 1 , because the people who lived there hadn't looked after it. They had polluted the whole planet heavily 2 rubbish and pollution. As a result, there were few plants and animals left.
One day, a little boy Jim was walking on the planet, when he passed a cave（山洞）and 3 a small red flower inside. The flower was very sick — almost dying, so Jim 4 dug up the flower, with roots, soil and everything. Then he started looking for a place5 care of it. He searched all over the planet, but everywhere was polluted so much that there was6 place the flower could possibly live in. Then he looked up at the moon. It seemed that maybe the plant could live there.
Jim decided to go there. He7 a spaceship and put the little red flower in the back, then they flew to the moon. Far away from all that pollution, the flower soon grew up, giving birth to others, and these other flowers spread onto other flowers. Soon the whole moon was completely covered with flowers. When the little boy's flowers came out, the moon gave out a soft red8. It was the most beautiful scenery he had ever seen.
Maybe the story is telling us9 we don't look after the planet, a day will come when flowers can only grow on the moon. So we must be friendly to10 place that we are living in now.
