题目内容
Forests have always been useful and important to man who make use of them in many ways. Every day trees are serving man everywhere. Trees supply man with fruits and building materials in the form of wood, without trees it would be impossible to build houses, boats, bridges and so on. Furniture such as desks, chairs and beds is made of wood, trees can stop man from terrible heat. They're also useful in preventing good and rich top soil from being washed away during heavy rains.
If there were no trees, heavy rains would wash away the rich surface soil that is so important to plants. The result is that the land will become a desert. There are plenty of desert areas in the world. A long time ago these desert areas used to be very rich areas, but man in the past had no enough knowledge about science of nature, they cut down too many trees in the area where they lived and never planted new ones. By and by the rich surface soil was blown and washed away by strong winds and heavy rains. In the end the rich land changed into useless deserts where nothing could grow.
1 . According to the passage,__________.
A. a long time ago, man didn't know how to make use of wood
B. trees are not as useful as they were in the past
C. trees were more found in the past than they are today
D. people have always found trees useful
2. Some deserts were once___________.
A. very good lands B. covered by ice
C. very cold D. dry and useless
3. From the passage, we know that man must ________.
A. do nothing to keep the balance of nature
B. do something to stop the balance of nature
C. try his best to keep the balance of nature
D. do his best to stop the balance of nature
【小题1】C
【小题2】A
【小题3】C
七星图书口算速算天天练系列答案
Section B
Directions: Complete the following passage by using the words in the box. Each word can only be used once. Note that there is one word more than you need.
|
A．additional |
B．producing |
C．regular |
D．predicted E. identified |
E atmosphere G. matched H. reducing I. carried J. increase
Forests in the northern half of the globe could be growing faster now than they were 200 years ago as a result of climate change, according to a study of trees in eastern America. The trees appear to have faster growth rates due to longer growing seasons and higher concentrations (浓度) of carbon dioxide in the ___41___.
Geoffrey Parker, a scientist at the Smithsonian Environmental Research Centre in Edgewater. Maryland, said that the increase ha the rate of growth was unexpected and might be ___42___ to the higher temperatures and longer growing seasons documented in the region. The growth may also be influenced by the significant ___43___ in atmospheric CO2, he said.
"We made a list of reasons these forests could be growing faster and then excluded half of them," Dr. Parker said. Their study suggests that northern forests may become increasingly important in ___44___ the influence of man-made CO2 on the climate.
Dr. Parker and his colleagues have ___45___ out a detailed record of the trees on a(n) ___46___ basis since 1987. They calculated that due to the global warming the forest is producing ___47___ tons of wood each year.
The scientists ___48___ the land with trees at different stages of growth and found that both young and old trees were showing increased growth rate. More than 90 per cent of the tree groups had grown by between two and four times faster than the scientists had ___49___ from estimates of the long-term rates of growth.
Directions: Complete the following passage by using the words in the box. Each word can only be used once. Note that there is one word more than you need.
|
A. additional B. producing C. regular D. predicted E. identified E atmosphere G. matched H. reducing I. carried J. increase |
Forests in the northern half of the globe could be growing faster now than they were 200 years ago as a result of climate change, according to a study of trees in eastern America. The trees appear to have faster growth rates due to longer growing seasons and higher concentrations (浓度) of carbon dioxide in the ___1.___.
Geoffrey Parker, a scientist at the Smithsonian Environmental Research Centre in Edgewater. Maryland, said that the increase ha the rate of growth was unexpected and might be ___2.___ to the higher temperatures and longer growing seasons documented in the region. The growth may also be influenced by the significant ___3.___ in atmospheric CO2, he said.
"We made a list of reasons these forests could be growing faster and then excluded half of them," Dr. Parker said. Their study suggests that northern forests may become increasingly important in ___4.___ the influence of man-made CO2 on the climate.
Dr. Parker and his colleagues have ___5.___ out a detailed record of the trees on a(n) ___6.___ basis since 1987. They calculated that due to the global warming the forest is producing ___7.___ tons of wood each year.
The scientists ___8.___ the land with trees at different stages of growth and found that both young and old trees were showing increased growth rate. More than 90 per cent of the tree groups had grown by between two and four times faster than the scientists had ___9.___ from estimates of the long-term rates of growth.
Complete the following passage by using the words in the box. Each word can only be used once. Note that there is one word more than you need.
| A. additional B. producing C. regular D . predicted E. identified E atmosphere G. matched H. reducing I. carried J. increase |
Forests in the northern half of the globe could be growing faster now than they were 200 years ago as a result of climate change, according to a study of trees in eastern America. The trees appear to have faster growth rates due to longer growing seasons and higher concentrations (浓度) of carbon dioxide in the ___41___.
Geoffrey Parker, a scientist at the Smithsonian Environmental Research Centre in Edgewater. Maryland, said that the increase ha the rate of growth was unexpected and might be ___42___ to the higher temperatures and longer growing seasons documented in the region. The growth may also be influenced by the significant ___43___ in atmospheric CO2, he said.
"We made a list of reasons these forests could be growing faster and then excluded half of them," Dr. Parker said. Their study suggests that northern forests may become increasingly important in ___44___ the influence of man-made CO2 on the climate.
Dr. Parker and his colleagues have ___45___ out a detailed record of the trees on a(n) ___46___ basis since 1987. They calculated that due to the global warming the forest is producing ___47___ tons of wood each year.
The scientists ___48___ the land with trees at different stages of growth and found that both young and old trees were showing increased growth rate. More than 90 per cent of the tree groups had grown by between two and four times faster than the scientists had ___49___ from estimates of the long-term rates of growth.