A green house is a building made of glass which is used for keeping warm when the outside temperature is low. In a similar way there are several gases in the atmosphere (mixture of gases that surround the earth) which trap the heat produced by the sun and prevent it from escaping. These gases are known as “greenhouse gases”. And the way in which they trap heat in the atmosphere is called the “greenhouse effect”. This is not simply air pollution. Most of the main greenhouse gases exist naturally in small amounts in our atmosphere, and without them the earth would be 30 degrees colder and human life would not exist. In other words, the greenhouse effect is a natural course which is to some degree helpful to us.
The problem is that in the last century and a half, we have been putting too many of these gases into the earth’s atmosphere by burning large quantities of coal and oil and by cutting down forest. The rapid increase in greenhouse gases is making the world warmer. The world’s temperature has already gone up by half a degree this century, and the sea level has risen by 10 centimetres. If the amount of carbon dioxide in the atmosphere doubles, there will probably be a rise in the earth’s temperature of between I and 4℃;. This may seem a small increase, but it would be enough to cause major changes in geography and agriculture. Large areas of the world would be flooded, and some areas would become dry and unable to produce crops. It is important, too, to consider that there may be a delay of about 30 years in the greenhouse effect. This means that we are probably experiencing only now the effect of the gases put into the atmosphere before the 1960s. Since then, our use of these gases has greatly increased. According to the passage, we can know “greenhouse effect” means_______.
| A．the way in which gases are used for keeping plants warm |
| B．a natural course that is to a certain degree useful to us |
| C．the way “greenhouse gases” trap heat on the earth |
| D．the whole course in which greenhouse gases prevent heat |
If there were no greenhouse effect,_______.
| A．all plants would not grow on our planet |
| B．soil would reduce the temperature by 30 degrees |
| C．man would breathe the cleaner air |
| D．people couldn’t live in the earth |
Which of the following is not true?
| A．Burning too much coal and oil produces lots of greenhouse gases. |
| B．It has become warm on the earth now than in the past. |
| C．Gases put into the atmosphere now will affect the earth years later. |
| D．The temperature in a greenhouse is as high as that in the atmosphere. |
Suppose the earth’s temperature rose by 3 degrees, _______.
| A．great harm will be done to mankind |
| B．the sea level would go up by 10 centimeters |
| C．all the land in the world would be flooded |
| D．crops would be unable to grow on the earth |
This passage mainly deals with ________.
| A．the concept (概念) and the harm of the greenhouse |
| B．the relation between greenhouse gases and man |
| C．the concept and change of greenhouse effect |
| D．the effect of the rise of the earth’s temperature |
阅读下面短文并回答问题，然后将答案写到答题卡相应的位置上(请注意问题后的字数要求)。
Each and every one of us is responsible for the greenhouse nts should the need arise-as it almostpected, and is prepared to tion, something comes along to gases we give out in our daily actions and choices．Therefore，combating climate change is going to take the combined efforts of everyone on the planet．
The average household carbon footprint in China is 2.41 tons of carbon dioxide annually．That's enough to fill half an Olympic swimming pool．
Surprised? Well,．here's how you can work to reduce it：
1．Take showers rather than baths and reduce your shower time by two minutes．This will save water and give you an extra two minutes in bed．
2．Don't purchase unnecessary clothes，and be careful about the materials you buy．Wool and cotton have a really high greenhouse gas impact．Manmade fibers are a better choice．
3．Try to buy high-quality，long-lasting products even though they．A laptop is more efficient than a desktop，and a small screen TV is better than a big flat-screen．
4．Only turn the water heater on when necessary，and adjust temperature controls to avoid overheating．Put a lid on a pan when boiling water．
5．When using the washing machine，be sure there's a full load and turn the temperature down if it's not really dirty．
6．The greediest home device along with the washing machine is the fridge．Make sure it's as efficient as possible by keeping it out of direct sunlight and away from the oven or heater．Don't put food in when it's still warm．
7．Only buy the amount of food you need and if there are leftovers，get creative．For instance，make them into a soup．Ask to take food home from restaurants if there's some left，but remember to take your own container to avoid using a disposable carton．How does the author introduce the topic of the text?(no more than 5 words)
Fill in the blank in Paragraph 6 with proper words．(no more than 5 words)
Why do we keep the fridge out of direct sunlight?(no more than 5 words)
What does the author say about leftovers?(no more than 14 words)
What is the main idea of the text?(no more than 6 words)
American researchers have developed a technique that may become an important tool in fighting AIDS virus from attacking its target-cells in the body's defense system．When AIDS virus enters the blood，it searches for blood cells called T4 lymphocytes(淋巴细胞)．The virus connects to the outside of T4 lymphocytes．Then it forces its way inside．There it directs the cells' genetic material to produce copies of the AIDS virus．This is how AIDS spreads．
Researchers think they may be able to stop AIDS from connecting to T4 ceils．When AIDS virus finds a T4 cell，it actually connects to a part of the cell called CD4 protein．
Researchers want to fool the virus by putting copies or clones of the CD4 protein into the blood．This way the AIDS virus will connect to cloned protein instead of the real ones．Scientists use genetic engineering methods to make the clones．Normally a CD4 protein remains on the T4 cell at all times；the AIDS virus must go to it．
In a new technique，however，the cloned CD4 protein is not connected to a cell．It floats freely，so a lot more can be put into the blood to keep the AIDS virus away from real CD4 protein on T4 cells．One report says the．AIDS virus connects to cloned protein just as effectively as it connects to real protein．That report was based on tests with blood cells grown in labs．The technique is just now beginning to be tested in animals．If successful，it may be tested in humans within a year．The new technique can.
| A．cure AIDS |
| B．kill the AIDS virus |
| C．prevent the AIDS virus from spreading |
| D．produce new anti-AIDS cells |
When the AIDS virus enters the blood，it is reproduced by.
| A．itself |
| B．the blood cells |
| C．the CD4 protein |
| D．the genetic material of T4 lymphocytes |
The AIDS virus connects to cloned protein instead of the real CD4 protein because.
| A．cloned protein stays On the T4 cells |
| B．it connects to cloned protein more effectively |
| C．cloned protein is made by genetic engineering methods |
| D．cloned protein floats freely，and many more can be put into the blood |
Which of the following statements is NOT true?
| A．The new technique has been tested in labs． |
| B．The new technique is being tested in animals． |
| C．The new technique may be tested in humans． |
| D．The new technique is now under clinic test． |
The best title for this passage is．
| A．AIDS-a deadly disease |
| B．A new technique in fighting AIDS |
| C．The spread of AIDS virus |
| D．The cloned CD4 protein |
Elderly adults who regularly drink green tea may stay more active and independent than their peers over time，according to a Japanese study that covered thousands of people．
Green tea contains antioxidant chemicals that may help ward off the cell damage that can lead to disease．Researchers have been studying green tea's effect on everything from cholesterol(胆固醇)to the risk of certain cancers，with mixed results so far．
For the new Japanese study，researchers decided to examine the question of whether green tea drinkers have a lower risk of frailty and disability as they grow older．
Tomata and his colleagues followed nearly 14，000 adults aged 65 or older for three years．
They found those who drank the most green tea were the least likely to develop “functional disability”，or problems with daily activities or basic needs，such as dressing or bathing．
Specifically，almost 13 percent of adults who drank less than a cup of green tea per day became functionally disabled，compared with just over 7 percent of people who drank at least five cups fl day．
The study did not prove that green tea alone kept people active as they grew older．
Green-tea lovers generally had healthier diets，including more fish，vegetables and fruit，as well as more education．lower smoking rates，fewer heart attacks and strokes，and greater mental sharpness．
They also tended to be more socially active and have more friends and family to rely on．
Although it's not clear how green tea might offer a buffer(缓冲剂)against disability，Tomata's team did note that one recent study found green tea extracts(提炼物)seem to increase leg muscle strength in older women．
While green tea and its extracts are considered safe in small amounts，they do contain caffeine and small amounts of vitamin K，which means it could block drugs that prevent blood thickened．Which of the following can summarize the passage best?
| A．Green tea makes you less active． |
| B．Green tea makes you less disabled． |
| C．Green tea makes you more friendly． |
| D．Green tea makes you more educated． |
The underlined word“ward off”in Paragraph 2 probably means.
| A．form | B．absorb | C．remove | D．prevent |
Tomata and his colleagues wanted to.
| A．prove whether the Japanese study is correct |
| B．know if green tea drinkers are independent |
| C．help nearly 14，000 adults aged 65 or older |
| D．study green tea's effect on cholesterol |
Which of the following is NOT the advantage of green tea?
| A．Reduce functional disability． |
| B．Keep old people active． |
| C．Make more friends． |
| D．Suffer fewer heart attacks． |
It can be inferred from the last paragraph.
| A．green tea is safe to drink |
| B．green tea should be drunk properly |
| C．green tea is poisonous for old people |
| D．vitamin K is helpful to us |
WASHINGTON——Chinese Vice-President Xi Jinping arrived at Andrews Air Force Base in Washington，February 13，2012．Vice-President Xi Jinping said he would explore important problems in an active and practical manner with his America hosts on Monday during his five-day official trip here after arriving at Andrews Air Force Base in the afternoon．
In a written statement given upon his arrival，Xi said as the international situation experiences complex and complete changes，China and the United States have more extensive common interests and shoulder more important common responsibilities on the present world stage.
The purpose of the current visit is to “carry out the important consensus reached by President Hu with President Obama during his visit to the United States in January last year and to advance the building of the China—US cooperative partnership based on mutual respect and mutual benefit”，said Xi.
According to Xi，bilateral(双边的)relations have moved forward in spite of some twists and turns during the past several decades．
“This has brought enormous benefits to our two countries and two peoples，and has had a positive, far-reaching impact on peace，stability and the prosperity of the Asia-Pacific region and the world at large”．
Xi said that“whether we can seize opportunities，tackle challenges and build a cooperative partnership at the new historical starting point matters to the future of our two countries and the world as a whole．”
Xi said he looks forward to engaging in extensive dialogue and exchanges with Americans from various sectors to enhance cooperation and strengthen friendship．
Xi is scheduled to meet US senior government officials，including Henry Kissinger，Brent Scowcroft，Zbigniew Brzezinski，Madeleine Albright and Henry Paulson this evening to listen to their advice on China-US ties．
Meetings between Xi and US Vice-President Biden and President Obama are scheduled on Tuesday.The passage mainly tells us.
| A．Xi's five-day official trip |
| B．China-US cooperative partnership |
| C．Xi is set to discuss important bilateral problems |
| D．China and the US have more common interests |
It can be inferred from the second paragraph that．
| A．the current world stage remains peaceful |
| B．China and US should build the cooperative partnership |
| C．Xi himself wrote a statement about his arrival |
| D．China and the US have the equal rights |
The underlined word“consensus”in Paragraph 3 means．
| A．agreement | B．opinion | C．partnership | D．benefit |
According to tile passage，bilateral relations between China and US have experienced．
| A．enormous dialogues | B．extensive exchanges |
| C．rnany challenges | D．various hardships |
What is Xi's attitude towards the visit?
| A．Respectful． | B．Optimistic． | C．Approving． | D．Expectant． |
The personal computer has overtaken the family dog as man's best friend．according to a study．
Researchers found that just 6 per cent of us believe that“ most people rely more on their dog than they do on their PC”，while 67 per cent think the opposite to be true．
Even 38 per cent of dog owners admitted to relying more on their PC than on their dog, although 36 per cent disagreed.
And 71 per cent of 18 to 24-year-old dog owners said they relied more on their computer．
Paul Allen，editor of Computeractive magazine said：“These days you can even you’re your PC for fl walk，provided you have a laptop or tablet.”
“It's only a matter of time until the first PC that fetches your slippers．”
Researchers questioned 2，000 British adults to find out the change modern technology has brought to their home life．
They found that male dog owners are almost twice as likely as female owners to rely on their computer than a canine companion.
Mr．Allen said：“With broadband bringing them global news and newspaper sales falling，the family dog even misses out on the pleasure of taking the paper to his owner．”
But it's not all bad news for obedient dogs．
“The family PC has given dog owners access to a wealth of resources and information that can help with the long-term care that a dog needs，”Mr．Allen said．Who are most likely to rely on computers?
| A．Teens． |
| B．People in their early twenties． |
| C．People in their early thirties． |
| D．People in their early forties． |
What is the general idea of the passage?
| A．The personal computer has replaced the dog as man's best friends． |
| B．The computer and the dog as man's best friends． |
| C．Modern technology has brought changes to people's home life． |
| D．The dog as a pet will disappear completely from people's life． |
The advantage of dogs as pets over the personal computer now is that
| A．the dog can go out for a walk with people |
| B．the dog can help people fetch something |
| C．the dog can bring people more pleasure |
| D．the dog is more likely to follow its owner's orders |
The underlined word“canine”in Paragraph 8 probably means
| A．human | B．pet | C．family | D．dog |
According to Mr. Allen，the personal computer
| A．won't have effect on newspaper sales |
| B．can't help people take better care of the dog |
| C．will drive the dog as a pet out completely |
| D．will be able to help people fetch something |