试题库在线考试题库-历年真题模拟试题及答案-考博英语在线试题测试中心-希赛网

题库

首页 > 题库 > 吉林大学

I remember（） to help us if we ever were in difficulties.

Look at the terrible situation I am in！If only I （） your advice.

（） is known to the world, Mark Twain is a great American writer.

Whenever possible, Ian （）how well he speaks Japanese.

She often says her greatest happiness（） serving the handicapped children.

Our teacher didn’t have time so far to go into it（） , but he gave us an idea about his plan.

The purpose of the lecture was to（）the masses of the United States with the elementary problems of Latin America.

Although he is in his fifties, his（） arms are as powerful as those of a young man.

Since you changed lanes without signaling, you are as much to（）for the accident as us.

Hard work and malnutrition （）his health and he looked thin and pale.

Knowing that he had been admitted to Cambridge University, he was too excited to be（） on the phone.

The doctors don’t （） that the patient will live much longer.

The owner of a car is no longer forced to rely on public transportation and is therefore, not（） to work locally.

Hundreds of people （）on the playground for watching the Dragon Lantern show.

His criticism injured Jenny’s（） .So she is feeling sad now.

The roof（） under the weight of the snow.

She felt that she was too（） with problems to be able to study properly.

The safari hunter was nearly （）to death by a herd of elephants.

Carbon dioxide and other naturally occurring gases in the earth’s atmosphere create a natural greenhouse effect by trapping and absorbing solar radiation. These gases act as a blanket and keep the planet warm enough for life to survive and flourish. The warming of the earth is balanced by some of the heat escaping from the atmosphere back into space. Without this compensating flow of heat out of the system, the temperature of the earth’s surface and its atmosphere would rise steadily.Scientists are increasingly concerned about a human-driven greenhouse effect resulting from a rise in atmospheric levels of carbon dioxide and other heat-trapping greenhouse gases. The man-made greenhouse effect is the exhalation of industrial civilization. A major contributing factor is the burning of large amounts of fossil fuels—coal, petroleum, and natural gas. Another is the destruction of the world’s forests, which reduces the amount of carbon dioxide converted to oxygen by plants. Emissions of carbon dioxide, chloro fluorocarbons, nitrous oxide, and methane from human activities will enhance the greenhouse effect, causing the earth’s surface to become warmer. The main greenhouse gas, water vapor, will increase in response to global warming and further enhance it.There is agreement within the scientific community that the buildup of greenhouse gases is already causing the earth’s average surface temperature to rise. This is changing global climate at an unusually fast rate. According to the World Meteorological Organization, the earth’s average temperature climbed about 1 degree F in the past century, and nine of the ten warmest years on record have occurred since 1990. A United Nations panel has predicted that average global temperatures could rise as much as 10.5 degrees F during the next century as heart-trapping gases from human industry accumulate in the atmosphere.What are the potential impacts of an enhanced greenhouse effect? According to estimates by an international committee, North American climatic zones could shift northward by as much as 550 kilometers (340 miles). Such a change in climate would likely affect all sectors of society. In some areas, heat and moisture stress would cut crop yields, and traditional farming practices would have to change. For example, in the North American grain belt, higher temperatures and more frequent drought during the growing season might require farmers to switch from corn to wheat and to use more water for irrigation.Global warming may also cause a rise in sea level by melting polar ice caps. A rise in sea level would accelerate coastal erosion and inundate islands and low-lying coastal plains, some of which are densely populated. Millions of acres of coastal farmlands would be covered by water. Furthermore, the warming of seawater will cause the water to expand, thus adding to the potential danger.Global warming has already left its fingerprint on the natural world. Two research teams recently reviewed hundreds of published papers that tracked changes in the range and behavior of plant and animal species, and they found ample evidence of plants blooming and birds nesting earlier in the spring. Both teams concluded that rising global temperatures are shifting the ranges of hundreds of species — thus climatic zones—northward. These studies are hard evidence that the natural world is already responding dramatically to climate change, even though the change has just begun. If global warming trends continue, changes in the environment will have an enormous impact on world biology. Birds especially play a critical role in the environment by pollinating plants, dispersing seeds, and controlling insect populations; thus, changes in their populations will reverberate throughout the ecosystems they inhabit.1.According to the passage, how do carbon dioxide and other greenhouse gases affect the earth-atmosphere system?2.What can be inferred from paragraph 3 about global climate change?3.According to paragraph 4, what is one effect that climate change could have on agriculture in North America?4.Why does the author use the word “fingerprint” in paragraph 6?5.What evidence does the author give that climatic zones have shifted northward?

As you all know, the United States is a country on wheels. Nearly eight million new cars are made each year, four households out of five own at least one car, and more than a quarter have two each. Yet you’ll be surprised to learn that some of the car-owners even suffer from malnutrition.In 1968, a nation-wide survey of malnutrition was made for the first time. It found that 10 million people are suffering in health through inadequate feeding; the causes of their plight were varied. Unemployment over a long period should be considered as the main factor. And unemployment, strange to say, nine times out of ten results from automation, both in industrial and agricultural areas. For example, in the rural South when a cotton plantation suddenly cuts its force from 100 people to three, the problem to help the displaced arises. So is the case with industrial automation. In fact, probably 2 million jobs are made unnecessary each year in the whole country as a result of the automation process, thus making unemployment a chief social concern. According to government statistics, the number of people unemployed was over 5 percent for the period from 1958 to 1963. In July 1981, it rose to 7.8 percent. As a matter of fact, it has long been known that even during the most prosperous periods there have been people without enough to eat. So I think that’s why President Kennedy said in his inauguration speech in 1961, if the government did not help the poor, it could nor save the rich.In 1966, the Social Security Administration calculated that a family of four needed an income of $3,355 a year to be above the line of poverty. And in 1977, the average poverty line of the country was slightly more than $6,200 annual income for a non-farm family of four. According to the Social Security Act, families of that size below poverty line are eligible to receive benefits from the special welfare program. The average weekly payment of benefits now is equivalent to 36 percent of the worker’s normal wage. And the number of people who receive government benefits is increasing. In 1973, social insurance payments by governments, mainly to old age pensioners and people who had lost their jobs or were off work through illness, amounted to $86,000 million. Those not fully qualified for insurance payments received $29,000 million in public aid.But problems still exist. Many people are not reached by the anti-poverty program, because local authorities and agencies do not want to play their part or do not gave the resources to do so. Some poor people will not accept help for various reasons. Of course, there are some more important factors which lie in the stricture of the society, but I don’t consider it necessary to dig into them here. Yet we will perhaps agree that social welfare programs have solved to some extent the problems of feeding, clothing and housing those below the poverty line. On the whole, it perhaps might be said that American people are living a better life than people in most other countries.1.The United States is called a country on wheels because （）.2.According to a 1968 survey, ten million Americans found themselves in a difficult health situation chiefly due to（） 3.The author uses “the displaced”(Line 5, Para. 2) to refer to those who are （）.4.The word “eligible” (Line 4, Para. 3) is synonymous with “（）5.Americans are living a better life than those in most of other countries because, to some degree （）.

暂未登录

学员用户尊享特权

老师批改作业做题助教答疑学员专用题库高频考点梳理

上一页 1 2 3 4 5 6 下一页