Do you know something about tree rings (年轮)? Do you know they can tell us what the weather was like even hundreds of years ago?
A tree will grow well in a climate (气候) with lots of sunshine and rainfall (雨量). And little sunshine or rainfall will limit (限制) the growth of a tree. We can see the change of the climate by studying the tree rings. For example, if you want to find out the weather of ten years ago, you should count (数数) the rings of a tree from the outside to the inside. If the tenth ring is far from the eleventh ring, then we’re sure that it was sunny and rainy most of that year. If it is close to the eleventh ring, then the climate that year was bad.
Tree rings are important not only for studying the history of the weather but also for studying the history of man. Many years ago there lived a lot of people at a place in New Mexico. But now you can find only sand but no trees, no people. What happened?
A scientist studied the rings of the dead trees there. He found that the people had to leave because they had cut down all the trees to make fires and buildings. Because all the trees had gone, the people there had to move.
【小题1】________ in good climate.
| A．Tree rings grow far from each other | B．Tree rings become thinner |
| C．Tree don’t need sunshine or rainfall | D．People can cut down most of the trees |
【小题2】If you want to find out the weather of twenty years ago, you should study ________ of a tree from the outside to the inside.
| A．the twentieth ring | B．the tenth ring | C．the nineteenth ring | D．the twenty-first ring |
【小题3】What can we know by studying the tree rings of a tree?
| A．The history of the tree. | B．How the tree grew up. |
| C．The owner of the tree. | D．How the weather was before. |
【小题4】Why did the people leave the place in New Mexico?
| A．Because there were too many dangerous animals. | B．Because they found a better place. |
| C．Because there was too much rain there. | D．Because they cut down all the trees there. |
【小题5】Which can be the best title for the passage?
| A．Climate changes. | B．An interesting show. |
| C．Tree rings. | D．The pollution of environment. |
