For years scientists have been worried about the effects of air pollution on the earth’s natural conditions. Some believe the air inside many houses may be more dangerous than the air outside. It may be one hundred times worse.
Indoor air pollution can cause a person to feel tired, to suffer eye pain, headache and other problems. Some pollutants（污染物）can cause breathing disorders, diseases of blood and even cancer. Most scientists agree that every modern house has some kind of indoor pollution.
People have paid more attention to the problem now. It is true that when builders began making houses and offices they did not waste energy.To do this they build buildings that limited the flow of air between inside and outside. They also began using man-made building materials. These materials are now known to let out harmful gases.
As the problem became more serious, scientists began searching for a way to deal with it. They discovered a natural pollution control system for building—green plants. Scientists do not really know how plants control air pollution. They believe that a plant’s leaves absorb or take in the pollutants. In exchange the plant lets out oxygen through its leaves and tiny organizations on its roots. Scientists suggest that all buildings should have one large plant or several small plants inside for every nine square meters of space. Studies of different plants show that each absorbs different chemicals. So the most effective way to clean the air is to use different kinds of plants. Having green plants inside your house can make it a prettier and more healthy place.Generally speaking, indoor air pollution may be more harmful than the air outside because _ .
| A．indoor air pollution can often make people seriously ill |
| B．there may be more harmful gases outside the buildings |
| C．man-made building materials give off dangerous gases |
| D．the air indoors is polluted, which is very harmful |
Some kind of indoor pollution can be found in _______.
| A．every old house | B．every modern house |
| C．all kinds of houses | D．all kinds of offices |
The indoor air pollution is caused by ______.
| A．the man-made building materials and the limit of air-flow |
| B．the building way that the builders want to save energy |
| C．the building things that are made of man-made materials |
| D．the limit of the flow of air between inside and outside |
The reason why we should use different kinds of plants to clean the air is that ______.
| A．plants can let out all kinds of pollutants indoors |
| B．plants may take in more oxygen which people need |
| C．plants can make our houses prettier and more healthy |
| D．plants can absorb all kinds of harmful indoor chemicals |
Hummingbirds have got their name from the distinct “hum” sound made by their rapidly flapping (拍打) wings．The size of the bird decides the number of flaps it can do．The average lifetime of a hummingbird is 3 or 4 years, but some of them have lived beyond 12 years also．They are unique in many ways．Besides th
e number of rapid flaps they can do per second, they can also fly backwards.
Hummingbirds have an amazing sense of assessing the amount of sugar in the nectar (花蜜) they eat．They feed on the nectar of flowers．Hummingbirds do not feed on flowers whose nectar contains less than 10% sugar．Talk about a sweet tooth! As they cannot sustain themselves on nectar alone because of its poor nutritional value, they also feed on insects and spiders, and hummingbird food mixture that one can make at home.
Attracting hummingbirds to your garden will require a little planning．Plant butterfly bush, mimosa, coral bells, foxglove, morning glory, etc．These flowers attract the hummingbirds due to their high visibility (可见性) and nectar production．Avoid using pesticides (杀虫剂), as it will not only kill the insects around the flowers, but hurt the hummingbirds as well.
A common food for these birds is the sweettasting sugar syrup (糖浆)．Hummingbird food ingredients are just two: sugar and water．Take a large clean bowl, pour in it four cups of hot water, and dissolve one cup of table sugar in it．Stir slowly until all sugar has dissolved．
Hummingbirds, tiny as they are, collect a lot of nutrition．Providing them with hummingbird food mixture made of sugar water is a sure way to get all these beauties humming in your garden.Hummingbirds will have some little animals for their meal when .
| A．they can't find any green plants |
| B．they can't take in enough nutrition |
| C．they are bored with eating nectar |
| D．they are too old to fly |
In order to attract hummingbirds, you should .
| A．plan high trees |
| B．grow plants with small flowers |
| C．grow plants whose flowers are bright in color |
| D．grow plants coming into flower in the morning |
The main idea of the fourth paragraph is .
| A．how to prepare food for hummingbirds |
| B．where hummingbirds can find delicious food |
| C．hummingbirds can't live for long without sugar |
| D．hummingbirds like manmade food better than nectar |
COOL INVENTIONS
From school to band Practice, the Venturi Eclectic is an Earth-friendly way to get Where you want to go．This battery-powered, zero-emission (meaning it doesn't pollute the air) vehicle runs mainly on renewable energy．Solar panels on the Eclectic's roof absorb sun rays when you're driving．On windy days, you can connect a machine to the car's roof that collects energy from the wind while you're parked．The Eclectic's top speed is 28 miles an hour; the battery lasts for 31 miles before it needs to be recharged．Zipping (迅速行进) around the neighborhood has never been better.
Here's an eco-friendly way to tell time: Simply fill the Bedol Water-powered Clock's tank (箱) with water, add some lemon juice, and the clock will display the time without the need for environmentally harmful batteries．There are two sets of metal electrodes (电极) inside the water tank．Water contains ions (离子) that carry negative and positive charges．These ions complete a charge between the electrodes, creating enough energy to power the clock．Just refill the tank every few weeks, and this clock will keep on 
ticking.
Bloodhound SuperSonic Car (SSC) will be the first car to attempt to break the l,000-mile-an-hour barrier．(The current record is 763 miles an hour.) A concept for now, the rocket-shaped car gets its initial push to 350 miles an hour from a jet engine．Then a rocket fires up, pushing the SSC past 1,000 miles an hour．In order to keep the car streamlined (流线型的), the driver lies back at a 45-degree angle.
You're having a blast at your friend's birthday party．But when it's time to bring out the cake, everyone crowds around, blocking your view．No worries．Throw the Triops into the air, and this clever camera captures the view from above．The Triops can take three pictures at once, each from different angles．You can also record sounds and command the Triops to start shooting whenever it hears that noise．That's one smart camera.According to the passage, the Venturi Eclectic .
| A．is popular with businessmen | B．is suitable for a long trip |
| C．can turn wind into energy | D．has only a little gas emission |
What is the common characteristic of the Venturi Eclectic and the Bedol Water-powered Clock?
| A．They don't need batteries. | B．They are difficult to operate. |
| C．They can be powered by water. | D．They are environmentally friendly. |
The underlined phrase “having a blast” in the last paragraph probably means .
| A．looking at a picture | B．enjoying yourself |
| C．blowing out a candle | D．recording sounds |
Which of the following is TRUE according to the passage?
| A．The Triops is sensitive to sounds. |
| B．The driver of the SSC must be of great size. |
| C．The color of the Bedol Water-powered Clock is like that of lemon. |
| D．The SSC doesn’t have anything to do with a rocket actually. |
In 1995, Susan Boyle went to Glasgow to audition (试演) for My Kind of people, a televised talent show popular in the UK．She was immediately rejected．She was nervous during the audition, and felt she didn't perform well, but her brother said that she was rejected because of her pl
ain looks．Boyle was not discouraged and continued to sing at church and at the karaoke nights in a local pub.
Boyle suffered a personal loss in 1997, when her father passed away．After his death．Boyle put her big dreams on hold to care for her sick mother Bridget Boyle．The mother and daughter often talked of Susan's possible fame．Bridget Boyle encouraged her daughter to take part in singing competitions．“She was the one who said I should enter Britain's Got Talent．We used to watch it together.” Susan later told reporters．“She thought I would win.”
In 1999, Boyle used all of her savings to pay for a professional demo (样本唱片) tape．which she sent to record companies．In 2002, Boyle began taking singing lessons from voice coach Fred O'Neil．
In 2007, Boyle's mother passed away at the age of 91．A neighbor reported that when Bridget Boyle died, her daughter “wouldn't come out for three or four days or answer the door or phone.” She lived alone with her cat, Pebbles．For over a year, she refused to sing．But in August of 2008, O'Neil urged her to try out for Britain's Got Talent．Convinced that the performance would be an honor to her mother, Boyle auditioned in Glasgow, Scotland．She sang I Dreamed A Dream in the first round of the show, which was aired on 11 April 2009.
The 47-year-old Scottish woman's plain looks provided a sharp contrast (对比) to her powerfully beautiful voice．The performance astonished the audience and the judges．Online videos of her performance totaled over 40 million views within a week．Although she failed to win the final of Britain's Got Talent, Susan Boyle became globally popular．Her first album I Dreamed A Dream has sold over five million copies.Bridget Boyle's attitude towards her daughter's musical talent can be described as .
| A．critical | B．doubtful | C．indifferent | D．optimistic |
From Para．4 we learn that Boyle .
| A．was slightly discouraged by her voice coach |
| B．entered Britain's Got Talent to prove her ability |
| C．decided to give up her singing career |
| D．was deeply affected by her mother's death |
Which of the following is TRUE about Susan Boyle?
| A．Her international fame grew rapidly in 2008. |
| B．Her audition for My Kind of People failed. |
| C．She has never stopped singing since 1995. |
| D．She was the winner of Britain's Got Talent. |
In writing this passage, the author mainly intends to .
| A．tell us how Boyle's dream came true |
| B．let us know more about Boyle's personal life |
| C．show how Boyle was influenced by her family |
| D．explain how to enter and win a talent show |
When a dog bites a man, it usually doesn’t make news. However, this saying change when Beijing and several other Chinese cities announced the “Civilized Dog Raising” campaign in November.
The government will require Beijingers to get licenses for their dogs, and will enforce the one-dog, one-family policy. Police say the "one-dog policy" is aimed at reducing the number of dog bites and lowering the risk of rabies. According to the Ministry of Health, rabies has become the top infectious disease in China. Dangerous dogs and dogs taller than 35 centimeters, such as Great Danes, have been banned from urban areas.
Pet owners are also required to clean up their dog's droppings and make sure dogs are leashed (拴着), especially in public areas. Some public areas, such as banks, are closed to dogs entirely.
Dogs are regarded as man's best friend and the history of raising dogs can be traced back to the stone age. It therefore seems sad that dogs are unwelcome in Beijing. But it is not the case that Beijingers dislike dogs. Actually, there are many dog lovers in Beijing. The city now has more than 550,000 registered dogs, up 20 percent from the previous year.
The problem is, actually, about living space. Different from many Westerners, most Beijingers live in urban apartment buildings, not houses in the suburbs. There is very limited open space for walking dogs. The barking, the waste, and unleashed dogs in buildings, elevators and places people gather can cause fear, fights and frustration.
Beijing is not the only city to have a dog problem. Paris, London, New York and Vienna all face similar challenges and have common rules for dogs and their owners.Which of the following may be a suitable title for the story?
| A．Man's Best Friend | B．Civilized Dog Raising |
| C．No Room For Dogs | D．When A Dog Bites A Man |
What can be inferred from the above passage?
A．If a dog bites a m an, it will become an important news item. |
| B．Rabies is the most serious infectious disease in Beijing. |
| C．Soon there will be no dangerous dogs or dogs taller than 35 centimetres in Beijing. |
| D．Beijing has trouble accommodating so many dogs. |
According to the passage, what should you NOT do if you are a dog owner in Beijing?
| A．Walk your dog in public places. |
| B．Have more than one dog. |
| C．Raise your dog in urban apartment buildings. |
| D．Let your dog bark in places where people gather. |
In the writer's opinion, the main cause of the dog prob
lem in Beijing is _____________.
| A．the limited living space in urban areas |
| B．its lack of rules for dogs and their owners |
| C．Beijingers and westerners having different lifestyles |
| D．the increasing number of dangerous dogs |
Move Eart
h – it’s no science fiction
LONDON – Scientists have found an unusual way to prevent our planet from overheating: move it to a cooler spot. All you have to do is send a few comets (彗星) in the dire
ction of Earth,
and its orbit will be changed. Our world will then be sent spinning into a safer, colder part of the solar system.
This idea for improving our climate comes from a group of US National Aeronautics and Space Administration（NASA）engineers and American astronomers. They say their plan could add another six billion years to the useful lifetime of our planet—effectively doubling its working life.
The plan put forward by Dr Laughlin, and his colleagues Don Korycansky and Fred Adams ,needs carefully directing a comet or asteroid 
so that it passes close by our planet and sends some of its gravitational energy to Earth.
“Earth’s orbital speed would increase as a result and we would move to a higher orbit away from the Sun,” Laughlin said.
Engineers would then direct their comet so that it passed close to Jupiter or Saturn. The comet would pick up energy from one of these giant planets. Later its orbit would bring it back to Earth, and the process would be repeated. In the short term, the plan provides an ideal way to global warming, although the team was actually concerned with a much greater danger. The sun is certain to heat up in about a billion years and so “seriously compromise” our biosphere（生物圈）— by cooking us.
That’s why the group decided to try to save Earth.
The plan has one or two worrying aspects, however. For a start, space engineers would have to be very careful about how they directed their asteroid or comet towards Earth. The smallest miscalculation（误算）in orbit could fire it straight at Earth—with deadly consequences.
There is also the question of the Moon. As the current issue of Scientific American magazine points out, if Earth was pushed out of its current position it is “most likely the Moon would be stripped away from Earth,” it states. This would greatly change our planet’s climate.What makes the scientists plan to move Earth?
| A．A few comets are moving to the direction of Earth. |
| B．Earth’s working life is coming to an end soon. |
C．Earth will become too hot for mankind to keep alive. |
| D．The moon is moving farther and farther away from Earth. |
If the plan is successful, Earth will have a working life of ______years.
| A．12 billion | B．6 billion | C．18 billion | D．24 billion |
What serious problems might the plan cause according to the passage?
| A．The comet might hit Earth and man might lose the moon. |
B．Earth might be moved too far away and man might be frozen to deat h. |
| C．The comet might hit Jupiter or Saturn and never return to Earth. |
| D．Earth’s working life might be greatly shortened. |
What does the underlined word “compromise” mean?
| A．provide | B．benefit | C．share | D．endanger |
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