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In the atmosphere, carbon dioxide acts rather like a one-way mirror or the glass in the roof of a greenhouse which allows the sun's rays to enter but prevents the heat from escaping.
According to a weather expert' s prediction, the atmosphere will be 3℃ warmer in the year 2050 than it is today, if man continues to burn fuels at the present rate. If this warming up took place, the ice caps in the poles would begin to melt, thus raising sea level several metres and severely flooding coastal cities. Also, the increase in atmospheric temperature would lead to great changes in the climate of the northern hemisphere (北半球), possibly resulting in an alteration of the earth's chief food growing zones.
In the past, concern about a man-made warming of the earth has concentrated on the Arctic because the Antarctic is much colder and has a much thicker ice sheet. But the weather experts are now paying more attention to West Antarctic, which may be affected by only a few degrees of warming, in other words, by a warming on the scale that will possibly take place in the next fifty years from the burning of fuels.
Satellite pictures show that large areas of Antarctic ice are already disappearing. The evidence available suggests that a warming has taken place. This fits the theory that carbon dioxide warms the earth.
However, most of the fuel is burnt in the northern hemisphere, where temperatures seem to be falling. Scientists conclude , therefore, that up to now natural influences on the weather have gone beyond those caused by man. The question is: Which natural cause has most effect on the weather?
One possibility is the variable behavior of the sun. Astronomers at one research station have studied the hot spots and "cold" spots (that is, the relatively less hot spots) on the sun. As the sun rotates (使旋转), every 27. 5 days, it presents hotter or "colder" faces to the earth, and different aspects to different parts of the earth. This seems to have a considerable effect on the distribution of the earth's atmospheric pressure, and consequently on wind circulation. The sun is also changeable over a long term: its heat output goes up and down in cycles, the latest trend being downward.
Scientists are now finding shared relations between models of solar weather interactions and the actual climate over many thousands of years, including the last Ice Age. The problem is that the models are predicting that the world should be entering a new Ice Age and it is not. One way of solving this theoretical difficulty is to assume a delay of thousands of years while the solar effects overcome the inertia (惯性) of the earth's climate. If this is right, the warming effect of carbon dioxide might thus be serving as a useful opposed balance to the sun's fading heat .
66. It can be concluded that a concentration of carbon dioxide in the atmosphere would_________.
A. mean a warming-up in the Antarctic
B. raise the temperature of the earth' s surface
C. prevent the sun's rays from reaching the earth's surface
D. explain the cause of great changes in the climate in the northern hemisphere
67.The article was written to explain ___________.
A. the greenhouse effect
B. the solar effects on the earth
C. the causes affecting weather
D. the models of solar-weather interactions
68. Although the fuel consumption is greater in the northern hemisphere, temperatures there seem to be falling. This is__________.
A. mainly because the levels of carbon dioxide are rising
B. partly due to changes in the output of solar energy
C. possibly because the ice caps in the poles are melting
D. only due to the effect of the inertia of the earth' s climate
69. On the basis of their models, scientists believe the opinion that__________.
A. the climate of the world should be becoming cooler
B. the new Ice Age will be delayed by the greenhouse effect
C. the man-made warming effect helps to increase the solar effects
D. it will take thousands of years for the inertia of the earth's climate to take effect
70. If the assumption about the delay of a new Ice age is correct, ____________.
A. ice would soon cover the northern hemisphere
B. the greenhouse effect could work in favor of the earth
C. the best way to overcome the cooling effect would be to burn more fuels
D. the increased levels of carbon dioxide in the atmosphere could warm up the earth even more quickly
查看习题详情和答案>>Ticket price increases at HK Disney
Source：Xinhua | 02—05—2009 11：39
Hong Kong Disneyland announced on Tuesday it will raise weekday admission prices for mainland and overseas tourists by about 19 percent．But Hong Kong residents and tourists who purchase tickets through travel agents can still enjoy the old prices until June 30．
A one-day admission will cost HK $350($45)for adults and HK $250 for children aged up to 11 from Monday, the previous charges for weekends．Adults were previously admitted for HK $295 and children HK $210．
A Hong Kong Disneyland spokesman said the park does not expect the new pricing structure to have an immediate impact on attendances, as research shows guests choose when to visit the attraction based on time available rather than ticket prices．But the hikes(the rise of prices)drew immediate criticism from the industry．The greater tourism industry fears it may harm mainlanders willingness to visit Hong Kong．
Joseph Tung Yao-chung, executive director of Travel Industry Council of Hong Kong, said the decision was unwise in the current financial climate．He also urged the company to rethink its decision, during an interview with Southern Metropolis Daily．
1.On September 10 of 2009(weekday), Hong Kong residents and tourists will have to spend buying three children tickets．
A．HK $360 B．$ 360 C．HK $750 D．HK $885
2.There is a family with five people, John，his father，mother，grandfather and grandmother．They are from America, John is eleven years old．If they visit the place on June 30 2009(weekday)，they will spend about in total．
A．$212 B．$ 1650 C．HK $1400 D．$1390
3.What can we infer from the passage?
A．Joseph Tung Yao-chung disagreed about the ticket price increase at HK Disney．
B．Hong Kong Disneyland will make a lot of money by raising weekday admission prices for mainland tourists．
C．The Hong Kong Disneyland spokesman didn't like the new pricing structure．
D．Only tourists from mainland visit Hong Kong Disneyland．
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The word “conservation” has a thrifty meaning. To conserve is to save and protect, to leave what we ourselves enjoy in such a good condition that others may also share the enjoyment. Our forefathers had no idea that human population would increase faster than the supplies of raw materials: most of them, even until very recently, had the foolish idea that the treasures were “limitless” and could “last forever”. Most of the citizens of earlier generations knew little or nothing about the complicated and delicate system that runs all through nature, and which means that, as in a living body, an unhealthy condition of one part will sooner or later be harmful to all the others.
Fifty years ago, nature study was not part of the school work; scientific forestry was a new idea; wood was still cheap because it could be brought in any quantity from distant woodlands; soil destruction and river floods were not national problems; nobody had yet studied long-term climatic cycles in relation to proper land use; even the word “conservation” had nothing of the meaning that it has for us today.
For the sake of ourselves and those who will come after us, we must now set about correcting the mistakes of our forefathers. Conservation should be made part of everybody’s daily life. To know about the water table in ground is just as important to us as a knowledge of the basic math formulas. We need to know why all watersheds (上游集水区) need the protection of plant life and why the running current of streams and rivers must be made to give their full benefit to the soil before they finally escape to the sea. We need to be taught the duty of planting trees as well as of cutting them. We need to know the importance of big, grown trees, because living space for most of man’s fellow creatures on this planet is figured not only in square measure of surface but also in cubic (立方体的) volume above the earth. In a word, it should be our goal to restore as much of the original beauty of nature as we can.
The author’s attitude towards the use of natural resources is _________.
A. positive B. uninterested C. optimistic D. critical
According to the author, the greatest mistake of our forefathers was that _________.
A. they had no idea about scientific forestry
B. they had little or no sense of environmental protection
C. they were not aware of the importance of nature study
D. they had no idea of how to make good use of raw materials
To avoid repeating the mistakes of our forefathers, the author suggests that _________.
A. we plant more trees
B. natural sciences be taught to everybody
C. environmental education be directed toward everyone
D. we return to nature
How can you understand the underlined sentence in the last paragraph?
A. Our living space on the earth is getting smaller and smaller.
B. Our living space should be measured in cubic volume.
C. We need to take some measures to protect space.
D. We must preserve good living conditions for both birds and animals.
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