Tree Rings
Do you know something about tree rings? Do you know they can tell us what the weather was like, sometimes even hundreds of years ago?
A tree will grow well in a climate with lots of sunshine and rainfall. And little sunshine or rainfall will limit the growth of a tree. We can see the change of climate by studying the tree rings. For example, to find out the weather of ten years ago, count 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 near to the eleventh ring, then the climate was bad.
Tree rings are important not only for studying the history of weather but also for studying the history of man. Many centuries ago there lived a lot of people at a place in New Mexico. But now you can find only sand there—no trees and no people. What happened?
A scientist studied the rings of dead trees there. He found that the people had to leave because they had cut down all the trees to make fires and buildings. As all the trees had gone, the people there had to move.
1. ________ in good climate. ( )| A．Tree rings grow far from each other | B．Tree rings become thinner |
| C．Trees don't need sunshine or rainfall | D．People can cut down most of the trees |
| A．whether a tree was strong or not | B．whether people took good care of the trees or not |
| C．whether the climate was good or not | D．how old the trees were |
| A．Trees could tell the change of the weather. |
| B．Trees brought lots of sunshine and rain. |
| C．Trees could make weather not too hot or too cold. |
| D．Trees could be used fbr burning and building houses. |
| A．bad weather stopped the growth of trees |
| B．they no longer had water and the land became sand |
| C．they didn't have enough trees for burning |
| D．there was too much rain there |
相似题推荐
In August, it is very hot and wet in the southern part (南部) of the US. People there easily have heart trouble (心脏病) and other kinds of health problems (健康问题) during this month. In the Northeast (东北部) and the Middle West (中西部), people have heart trouble after the weather changes in February or March.
The weather can also influence (影响) intelligence (智力). For example, in a 1983 study, the IQ scores (分数) of some students were very high during a storm, but after the storm, their scores were low. Very hot weather, on the other hand, can decrease (减少) it.
Weather also influences people’s feelings. Winter may be a bad time for thin people. They usually feel cold during these months. They might feel depressed during cold weather and don’t want to do anything.
Low air pressure (气压) makes people feel free, but it also increases forgetfulness. People leave more bags and umbrellas on buses and in stores on low pressure days. There is “perfect weather” for work and health. People feel best at a temperature of about 64°F with 65 per cent humidity (湿度).
1. American people _______ may easily have heart trouble. ( )| A．in the southern part in August | B．in the northern part in July |
| C．in the Middle West in July | D．in the Northeast in August |
| A．during a storm | B．on a very hot day | C．when it is sunny | D．before the storm |
| A．兴奋的 | B．忧郁的 | C．愉快的 | D．担心的 |
| A．both the fat and the thin are healthy |
| B．the students do very well in exams |
| C．the air pressure is low |
| D．the humidity is 65% and the temperature is about 64°F |
| A．health | B．intelligence | C．health and intelligence | D．health, intelligence and feelings |
【推荐2】Air
Air is all around us. It is around us as we walk and play. From the time we are born (出生), air is around us on every side. When we sit down, it is around us. We can live without food or water for a few days, but we cannot live for more than a few minutes without (没有) air. When we are walking or playing, we need more air. When we are asleep, we need less air.
We live in air, but we cannot see it. We can only feel it. We can feel it when it is moving. Moving air is called wind. How can we make air move? Here is one way. Hold an open book in front of your face. Close is quickly. What can we feel? What you feel is air.
1. Air is around us as we walk and play.2. When we are asleep, we need no air.
3. We can see air but we can’t feel air.
4. People cannot live for more than a few minutes without air.
5. We call moving air “wind”.
B. Later, people could make a map. They walked around a place and wrote notes. Then they drew a map.
C. Sometimes, people went to other cities. There were no planes or trains then. So they went by ship. Compass could help them at the sea.
D. Now, when people walk on the road or drive a car, they can use the BDS. It’s very helpful!
1. 阅读短文，根据短文内容用阿拉伯数字给下列图片排序。
2. 根据短文内容选择正确的答案。
(1) How to find a way many years ago? Which one is NOT true?
A. They could look at the stars at night. B. They could use a map or a compass. C. They could use BDS.
(2) How to make a map many years ago?
A. They walked around a place and wrote notes, then they drew it. B. They used a computer. C. They thought it at night.
(3) People went to other cities by ______ many years ago?
A. plane B. ship C. bike
(4) BDS can help us ______.
A. do homework B. find the way C. clean the room
3. 根据实际情况回答问题。
Mr Young lives in Huidong. He is going to take a trip to Guangzhou with his friends tomorrow, how can they get there?
