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

　Some people are lucky enough to be born with a good sense of direction and even if they have only visited a place once, they will be able to find it again years later.
　　I am one of those unfortunate people who have poor sense of direction and I may have visited a place time after time but I still get lost on my way there. When I was young I was so shy that I never dared ask complete strangers the way and so I used to wander round in circles and hope that by some chance I would get to the spot I was heading for.
　　I am no longer too shy to ask people for direction, but I often receive replies that puzzle me. Often people do not like to admit that they didn’t know their hometown and will insist on telling you the way, even if they do not know it; others, who are anxious to prove that they know their hometown very well, will give you a long list of directions which you can not possibly hope to remember, and still others do not seem to be able to tell between their left and their right and you find in the end that you are going in the opposite direction to that in which you should be going.
　　If anyone ever asks me the way to somewhere, I always tell them I am a stranger to the town in order to avoid giving them wrong direction but even this can have embarrassing results.
　　Once I was on my way to work when I was stopped by a man who asked me if I would direct him the way to the Sunlight Building. I gave my usual reply, but I had not walked on a few steps when I realized that he had asked for directions to my office building. However, at this point, I decide it was too late to turn back and search for him out of the crowd behind me as I was going to meet with someone at the office and I did not want to keep him waiting.
　　Imagine my embarrassment when my secretary showed in the very man who had asked for directions of my office and his astonishment when he recognized me as the person he had asked.
　　60. What is the writer going to do when someone asks him for direction?
　　   A. He will direct the right way to the person willingly.
　　   B. He will reply to it by the means of being a stranger to the town.
　　   C. He will give the very person long list of direction.
　　   D. He is going to show the man an opposite direction.
　　61. Why did the writer consider himself to be an unlucky dog?
　　   A. Because of his poor sense of direction.
　　   B. Because he always forget the way to home.
　　   C. Because he did not have any friend.
　　   D. Because he used to be shy and dared not ask others the way.
　　62. How did the visitor feel when he was showed into the very room?
　　   A. He felt strange.                              B. He felt embarrassed.
　　   C. He felt very sad.                                   D. He felt astonished.
　　63. Who showed the right way to the interviewee according to the passage?
　　   A. Someone we don’t know.                 B. The writer did it for himself.
　　   C. The secretary did so.                        D. A warm-hearted old lady did it.

信息匹配A. Happiness lies in persistent pursuit.

B. Happiness is in your own hand.

C. Self-knowledge is positively related to happiness.

D. Happiness is based on comparison.

E. There does not exist a guide to happiness.

F. Happiness is all about doing what you want to.

以下是5个人对幸福的看法，请把个人的看法与上面对幸福的表述匹配起来。

1. Heather Mccoy

　Entering a bookstore, one cannot help but notice entire shelves devoted to books boating knowledge of the true path to happiness.

　Whether this wave of commercials and books can actually make people happier is the question. Happiness cannot be found by sticking to a narrow set of steps or rules. Finding happiness is not as simple as following a how-to-do handbook. It’s something that every person must find in his or her own way.

2. Gary Russell

　Does happiness grow proportionally with wealth? Hardly.

　Experiences teaches us material satisfaction comes only when one finds himself wealthier than those around him; and, in a similar manner, one feels of being lowered when facing a billionaire, while a worker with a monthly salary of several hundred dollars becomes the envy of the villagers in remote mountainous regions.

3. David Niven

　True happiness is not a result from human action. Results are temporary while happiness is everywhere and can neither be created nor destroyed. With true happiness there is no place for disappointments! True happiness may mean pain and restraint in the beginning but will lead to everlasting joy and freedom. To achieve true happiness, we should separate and remove the negatives. True happiness is realized by understanding one’s own self.

4. Joshua Party

　Happiness is a state of mind. you can be happy in almost any situation. Likewise, you can be unhappy in an equal number of situations.In the end, it’s your decision.

　If one can control one’s unhappiness, then one must be able to control one’s happiness. As far as I know, the human genome project has not been able to identify a single part of any human chromosome(染色体) which is responsible for happiness.

5. Laura Johnson

　So what makes me a happy person? Studying to be a journalist because I loved to write, not because it pays a lot of money. Skiing in the winter snow and swimming in the summer sun. Spending time with my close friends from home. Being in a stable family. Reading romance novels and watching movies. Having a boyfriend who knows more about rock and roll history than I do.