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We know that trees are useful in our everyday life. They 1 us many things, such as wood, oxygen, rubber, medicines and many other things. They can 2 tell us a lot about our climate. The following are the reasons. If you 3 a tree, you can see that it has many rings. Most trees grow one new ring 4 year. Because of the reason, we know 5 a tree is. A tree over a hundred years old means that it has more than a hundred 6 . When the climate is dry or very cold, the trees do not grow very much and their rings are usually 7 . When it is wet and warm, the rings are much thicker. If the rings are suddenly very thin or suddenly very thick, this means that the 8 changed suddenly. If we look at the rings on this tree, we can learn about the 9 for a hundred years. We can see 10 our climate is changing today.
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完形填空
One morning, Sue was riding her bike to school.She was late, so she decided to take a short cut （捷径）. But she made a mistake and 1 into a one-way street. The street was not very 2 . A car was coming from the other direction. The driver quickly drove to one side and drove into a shop window. The shop assistant was greatly 3 ! There was 4 everywhere.
Sue rode into the other side of the street and 5 a man, then an apple cart. The apple cart turned over and the apples went in all directions.
A group of students were having 6 in a small restaurant. Quickly they ran 7 the street. With their help, all the apples were 8 and put back on the cart. Luckily, 9 Sue nor the driver of the cart was hurt. A policeman came by and saw what happened. He 10 Sue from riding to school and asked her some questions, so Sue was even later for school.
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Wolves becomes fewer than before because people ________ trees all the time．
A．cut down
B．cut off
C．take off
D．cut across
Northeast China. It is the summer home of many red-crowned cranes. The cranes start their families there.
Xu Xiujuan's family cared for cranes in the Zhalong Nature Reserve for a long time.
The workers tried to increase the number of red-crowned cranes because these birds are very rare. In
the reserve Xu Xiujuan helped the workers care for the cranes when had babies.
Xu Xiujuan, a twenty-two-year-old girl, came to work in the Yancheng Reserve in Jiangsu in 1986.
She enjoyed her work very much. She loved cranes and she loved nature. When she walked in the
countryside, she always forgot the unhappiness in her life.
On 16th September, 1987, two little cranes from the Yancheng Reserve flew into the wild and did not
come back. Xu Xiujuan was worried and went to look for them in the evening. Someone told her that a
farmer caught the birds. She tried to get to the farmer's home as quickly as possible. So she decided to
take a short cut, but she had to cross a river. Sadly, the river was much deeper than she thought. While
crossing the river, the girl downed and never came out.
Xu Xiujuan donated her young life to the lovely red-crowned cranes.
C. She looked after the mother cranes there.
D. She went to look for the lost cranes there.
B. They wanted to start their families there.
C. They wanted to have more baby cranes.
D. They wanted Xu Xiujuan to look after the two little cranes.
B. For twenty-three years.
C.For more than a year.
D. The passage doesn't tell us.
B. 抄近路
C. 乘短途车
D. 作短暂休息
B. Xu Xiujuan lost her life in the deep river.
C. Xu Xiujuan died twenty-three years ago.
D. Xu Xiujuan died in a flood.