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Do you know something about tree rings (年轮)? Do you know they can tell us what the weather was l__1___, sometimes even hundreds of years ago?
A tree will grow well in a climate with lots of sunshine and rainfall. And l__2__ sunshine or rainfall will limit (限制) the growth of a tree. We can see the change of climate by studying the tree rings. For e___3___, to find out the weather of ten years ago, count the rings of a tree from o___4___ to the inside. If the t___5___ ring is far from the eleventh ring, then we are sure that it was sunny and rainy most of that year. If it is near to the eleventh ring, then the climate that year was bad.
Tree rings are i___6___ not only for studying the history of weather but also for studying the history of man. Long long ago there lived a lot of people at a place in New Mexico. But now you can find only s___7___ there—no trees and no people. What h____8___?
A scientist studied the rings of d___9__ trees there. He found that the people had to leave b__10___ they had cut down all trees to make fires and buildings. As all trees had gone, the people there had to move.
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people around the world. "Ma Yan's Diary" tells us about Ma's life. She lives in a poor village called
Zhangjiashu in Tongxin, Ningxia, and she has no money to go to school. But she is brave and has a
strong desire(欲望)to go to school.
Her mother gave her diary to a French reporter, Pierre Haski when he went to Zhangjisshu in 2001.
Now, it has been published in France Italy, Germany, Japan and China.
Ma is now a Junior Three student at Yuwang Middle School in Tongxin. Before this, she had to leave
school twice. When she had to stop going to school the first time, her mum told her there was no money
for her to go to school. She worked for 21 days and saved 13 yuan. With this money, she went back to
school. The second time, her family told her she had to leave school but her two brothers could stay.
"I want to study," Ma wrote in her diary. "Why can boys study but girls can't? It would be wonderful
if I could stay at school forever."
Ma loves school so much because she wants to have a better life.
"My parents work hard in the fields but they are still poor. They have no knowledge. Most girls in my
village leave school early and get married young. I don't want that kind of life," Ma said.
After her story became known, many French student sent money to her. Ma's dream is the same as
ever. She hopes to go to Tsinghua University and become a reporter. "Then , I can find poor kids like
me and help them, " she said.
B. Pretty.
C. Lucky.
D. Poor.
B. Britain
C. Japan
D. France
B. She wrote about the poor life in her village.
C. She is very good at writing.
D. Her diary was read by a French reporter.
B. Her brothers studied better than she did.
C. Girls were not equally treated(平等对待)in their village.
D. She didn't study hard.
B. get more money for her study in Tsinghua University
C. become more famous
D. get more knowledge to change her own life
The earth is our home and we must take good care of it. That is to say we must 1 the land, air and water clean. But man 2 a lot of pollution on earth since he first made fire, washed his clothes in the river and threw rubbish on the ground. Many years ago, pollution was not so serious 3 there were not so many people.
There were enough 4 air, land and water. When the land or the river was dirty in one place, man moved to 5 place. Man is 6 the whole world now. So there is 7 enough clean air, nor clean land, nor clean water now. The more people there are in one place, 8 environment they maybe have.
Perhaps you are afraid 9 is endless(无休止的) for people to produce pollution.
10 , we are glad to tell you that people have come to know the danger of pollution. And you can find more and more people are working hard to protect our earth.
1. A．have B．take C．watch D．keep
2. A．produced B．has produced C．is producing D．will produce
3. A．so B．if C．because D．but
4. A．clean B．old C．dirty D．new
5. A．other B．the other C．another D．others
6. A．pollute B．polluting C．clearing D．clear
7. A．neither B．both C．either D．none
8. A．the worst B．the worse C．the bad D．worse
9. A．that B．this C．what D．it
10. A．Quickly B．Especially C．Luckily D．Anyway
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The earth is our home and we must take good care of it. That is to say we must 1 the land, air and water clean. But man 2 a lot of pollution on earth since he first made fire, washed his clothes in the river and threw rubbish on the ground. Many years ago, pollution was not so serious 3 there were not so many people.
There were enough 4 air, land and water. When the land or the river was dirty in one place, man moved to 5 place. Man is 6 the whole world now. So there is 7 enough clean air, nor clean land, nor clean water now. The more people there are in one place, 8 environment they maybe have.
Perhaps you are afraid 9 is endless(无休止的) for people to produce pollution.
10 , we are glad to tell you that people have come to know the danger of pollution. And you can find more and more people are working hard to protect our earth.
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Take a second long piece of paper. Twist the paper once and glue the ends together. Now you
have made a Mobius band. For people studying maths, this band is uncommon.
This strange band was first made in the 1800s by a German man named August Mobius. Mr. Mobius studied maths. He wanted to find a way to show how this band works with maths. Understand it or not,
this band has only one surface. You can find this out for yourself.
If you draw a line on the surface of the paper before you twist and glue it, the line is only on one side
of the paper. The paper has two surfaces. However, if you draw a line after you make the Mobius band,
you can follow the line around all sides of the paper. In other words, the Mobius band must have only
one surface.
It is also very interesting to see what happens when you cut the band. If you cut the Mobius band in
half once down the line you drew, you do not get two Mobius bands. Instead, after you cut the band, it
turns into one large twisted ring. Then, if you cut this ring in half along the middle of the band again, you
get two connected Mobius bands.
Try it!
B. A paper ring for people to wear.
C. A metal ring for music.
D. An interesting twisted ring.
B. Cut the two surfaces of the paper into one.
C. Draw a line in the middle of the paper.
D. Twist the paper once and glue the two ends.
B. Two long pieces of paper.
C. Two Mobius Bands.
D. One large twisted ring.