题目列表(包括答案和解析)
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 .
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
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
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
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
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
A little old couple walked slowly into McDonald ’ s on one cold winter evening. It seemed that
they didn' t come to the right place with the young families and young couples eating that night.
The little old man walked right up to the cash register, placed his order with no hesitation and then paid for their meal. The couple took a table near the back wall and started taking food off the tray. There was one hamburger, one order of French fries and one drink. The little old man unwrapped the plain hamburger and carefully cut it in half. He placed one half in front of his wife. Then he carefully counted out the French fries, divided them in two piles and neatly placed one pile in front of his wife. He took a sip at the drink and then set the cup down between them.
As the man began to eat his few bites of hamburger, the crowd began to get restless. You could tell what they were thinking, “That poor old couple. All they can afford is one meal for the two of them. ”
As the man began to eat his French fries, one young man stood and came over to the old couple ’ s table. He politely offered to buy another meal for the old couple to eat. The old man replied that they were just fine. They were used to sharing everything.
As the little old man finished eating and was wiping his face neatly with a napkin，the young man could stand it no longer. Again he came over to their table and offered to buy some food.
After being politely refused again，he finally asked a question of the little old lady，" Ma ’ am, why aren' t you eating? You said that you share everything. What is it that you are waiting for?"
She answered, "The teeth.,’
According to the 1st paragraph, the old couple .
A. enjoyed the scene outside the McDonald' s
B. didn, t look suitable for the surroundings
C. loved being with young families and couples
D. liked the food in McDonald' s
The little old man cut the plain hamburger in half because .
A. he couldn' t finish eating it with one bite
B. he was very careful with his food
C. he ordered more than he could consume
D. he wanted to share it with his wife
The young man who offered to buy the old couple food was .
A. impolite B. stubborn C. sympathetic D. doubtful
From the old lady' s answer, we know that .
A. she was not interested in the food B. the couple suffered a terrible toothache
C. the couple did share everything D. she gave an irrelevant answer
On September 22, 2007, 108 Chinese cities took part in Car-Free Day, a global event held every year, for the first time.
China became the world’s second-largest auto market and third-largest car-maker in 2006. It has also become the second-largest greenhouse gas producer in the world, and is rapidly catching up with the United States. In this sense, China’s participation will greatly promote the Car-Free Day movement.
The number of cars on the road is going up rapidly in China. In Beijing, about 1,000 new cars are added to the streets on an average day.
Cars certainly offer people plenty of freedom to move around. But in many Chinese cities, appearance of too many cars has turned into a major problem. Getting stuck in traffic jams is an everyday experience for drivers.
Even worse is the environmental impact（影响）caused by cars. According to a national report, on a “smog day”, 79 percent of the air pollution is caused by cars.
The growing number of traffic accidents is another problem. Over 100,000 people die from traffic accidents every year in China, which is by far the highest number of road deaths in the world.
108 cities’ participation in Car-Free Day shows growing public concern about the traffic and environmental problems caused by cars.
On this day, all cars were banned from running in selected areas of the participating cities. People were encouraged to walk, cycle and use public transport. According to experts, the carbon monoxide in the atmosphere produced by cars was reduced by 3,000 tons on Car-Free Day.
With cleaner air and smoother traffic flow on the day, more cities will hopefully want to join the event next year. And more people might share the hope that Car-Free Day is not just on September 22, but a possibility 365 days of the year.
From the passage, we can know that China ______.
A. has the world’s highest number of road deaths
B. has the world’s largest auto market
C. is the world’s largest greenhouse gas producer
D. is the world’s second-largest car-maker
Which of the following is discussed in the passage?
A. The causes of car growth in China.
B. The effects of car growth in China.
C. The history of World Car-Free Day.
D. The popularity of World Car-Free Day.
On Car-Free Day in 2007, 108 cities in China ______.
A. didn’t allow people to drive
B. didn’t have air pollution
C. called on people to drive less
D. called on people to drive freely
Car-Free Day in China will ______.
A. be held all the year round
B. stop air pollution and traffic jams
C. attract more people to join in
D. reduce the production of cars
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
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