单选题It's in the Cards In recent years, more and more people have been paying for things with credit cards. There are now 565 million credit cards worldwide, but it doesn't stop there. Debit cards (电子记账卡) are being issued by banks, and store cards are being offered by many department stores. Bills and coins are gradually being replaced by "plastic money." In many countries, phone cards have been introduced for people to use in pay phones. In addition, cards made of paper are being replaced by plastic ones by many organizations and clubs. For example, if you belong to a sports club, your membership card may well be made of plastic. How safe is the plastic used to make these cards, though? Until now, most cards have been made from a plastic called PVC. While PVC is being produced, harmful chemicals are released into the atmosphere. One of the most dangerous chemicals that is released is dioxin, which is known to cause cancer in humans. A further problem is that, when a PVC card is thrown away, it is not biodegradable; this means that it does not "break down" and cannot be recycled. Obviously, recycling reduces pollution of the environment. The executive director of the environmental organization and charity Greenpeace, Peter Melchett, says, "If there is a solution to this-and an alternative then it would be madness not to use it." Greenpeace has found a solution and an alternative. Their new credit card is made entirely from a biodegradable plastic that uses plants. The card breaks down in around three months in soil; in this way, it is recycled. In contrast, a PVC card lasts for centuries. Greenpeace hopes that many organizations will soon follow their example and issue cards that do not threaten the public health.
单选题Have you talked to her
lately
?
单选题In arithmetic, a number stands for the size of a set of things.
单选题Effects of Environmental Pollution
If pollution continues to increase at the present rate, formation of aerosols (浮质) in the atmosphere will cause the onset (开始) of an ice age in about fifty years" time. This conclusion, reached by Dr S. I. Rasool and Dr S. H. Schneider of the United States Goddard Space Flight Centre, answers the apparently conflicting questions of whether an increase in the carbon dioxide (二氧化碳) content of the atmosphere will cause the Earth to warm up or increasing the aerosol content will cause it to cool down. The Americans have shown conclusively that the aerosol question is dominant.
Two spectres haunting conservationists have been the prospect that environmental pollution might lead to the planet"s becoming unbearably hot or cold. One of these ghosts has now been laid because it seems that even an increase in the amount of carbon dioxide in the atmosphere to eight times its present value will produce an increase in temperature of only 2℃ which would take place over several thousand years. But the other problem now looms larger than ever.
Aerosols are collections of small liquid or solid particles dispersed in air or some other medium. The particles are all so tiny that each is composed of only a few hundred atoms. Because of this they can float in the air for a very long time. Perhaps the most commonly experienced aerosol is industrial smog (烟雾) of the kind that plagued London in the 1950s and is an even greater problem in Los Angeles today. These collections of aerosols reflect the Sun"s heat and thereby cause the Earth to cool.
Dr. Rasool and Dr. Schneider have calculated the exact effect of a dust aerosol layer just above the Earth"s surface in the temperature of the planet. As the layer builds up, the present delicate balance between the amount of heat absorbed from the Sun and the amount radiated from the Earth is disturbed. The aerosol layer not only reflects much of the Sun"s light but also transmits the infrared (红外线的) radiation from below. So, while the heat input to the surface drops, the loss of heat remains high until the planet cools to a new balanced state.
Within fifty years, if no steps are taken to stop the spread of aerosols in the atmosphere, a cooling of the Earth by as much as 3.5℃ seems inevitable. If that lasts for only a few years it would start another ice age, and because the growing ice caps at each pole would themselves reflect much of the Sun"s radiation it would probably continue to develop even if the aerosol layer were destroyed.
The only bright spot in this gloomy forecast lies in the hope expressed by Dr. Rasool and Dr. Schneider that nuclear power may replace fossil fuels in time to prevent the aerosol content of the atmosphere from becoming critical.
单选题Nitrogen is the most plentiful gas in the {{U}}atmosphere.{{/U}}
单选题They didn't want anyone to know about their romance.A. adventureB. mysteryC. poemD. love
单选题I haven"t
achieved
very much today.
单选题The police arrested the suspect yesterday and
released
him this morning.
单选题This is not
typical
of English, but is a feature of the Chinese language.
单选题 阅读下面的短文,文中有15处空白,每处空白给出了4个选项,请根据短文的内容从 4个选项中选择1个最佳答案。
{{B}}
Migrant (移民的) Workers{{/B}} In the past twenty years, there
has been an increasing tendency for workers to move from one country to another.
While some countries have restricted (限制) most {{U}}(51) {{/U}} to local
people, others have attracted and welcomed migrant workers. This is particularly
the case in the Middle East, {{U}}(52) {{/U}} increased oil incomes have
enabled many countries to call in outsiders to improve local facilities (设施).
Thus the Middle East has attracted oil-workers {{U}}(53) {{/U}} the
U.S.A. and Europe. It has also brought in workers from many other countries,
{{U}}(54) {{/U}} South Korea and Japan. In view of the
difficult living and working {{U}}(55) {{/U}} in the Middle East, it is
not surprising that the pay is high to attract suitable workers. Many engineers
and technicians can {{U}}(56) {{/U}} at least twice as much money in the
Middle East as they can in their own country, and this is a major {{U}}(57)
{{/U}}. Sometimes a disadvantage has a compensating (补尝的)
advantage. For example, the {{U}}(58) {{/U}} living conditions often
lead to increased friendshipwhen workers have to {{U}}(59) {{/U}} on
each other for safety and comfort. In a similar way, many migrant workers can
save large sums of money partly because of the {{U}}(69) {{/U}} of
entertainment (娱乐) facilities. The work is often complex and full of problems
but this merely presents greater challenge to engineers who prefer to find
solutions to problems rather than do {{U}}(61) {{/U}} work in their home
country. One major problem which {{U}}(62) {{/U}}
migrant workers in the Middle East is that their jobs are temporary ones. They
are nearly always on {{U}}(63) {{/U}}, so it is not easy for them to
plan ahead with great confidence. This is to be {{U}}(64) {{/U}} since
no country welcomes a large number of foreign workers as permanent residents. In
any {{U}}(65) {{/U}}, migrant Workers accept this disadvantage, along
with others, because of the considerable financial benefits which they
receive.
单选题{{U}}Practically{{/U}} all animals communicate through sounds.
A. Almost
B. Clearly
C. Absolutely
D. Basically
单选题Argument among the speakers at the conference is bordering on violence. A. is close to B. is beside C. is next to D. is alongside
单选题Sedimentary rocks cover much of the Earth’s surface, but they are often {{U}}hidden{{/U}} by a thin veneer of soil.
单选题The graduate students will {{U}}convene{{/U}} in the Student Union.
单选题Bill Gates: Unleashing Your Creativity
I"ve always been an optimist and I suppose that is rooted in my belief that the power of creativity and intelligence can make the world a better place.
For as long as I can remember, I"ve loved learning new things and solving problems. So when I sat down at a computer for the first time in seventh grade, I was hooked. It was a chunky old teletype machine and it could barely do anything compared to the computers we have today. But it changed my life.
When my friend Paul Allen and I started Microsoft 30 years ago, we had a vision of "a computer on every desk and in every home," which probably sounded a little too optimistic at a time when most computers were the size of refrigerators. But we believed that personal computers would change the world. And they have.
And after 30 years, I"m still as inspired by computers as I was back in seventh grade.
I believe that computers are the most incredible tool we can use to feed our curiosity and inventiveness to help us solve problems that even the smartest people couldn"t solve on their own.
Computers have transformed how we learn, giving kids everywhere a window into all of the world"s knowledge. They"re helping us build communities around the things we care about and to stay close to the people who are important to us, no matter where they are.
Like my friend Warren Buffett, I feel particularly lucky to do something every day that I love to do. He calls it "tap-dancing to work". My job at Microsoft is as challenging as ever, but what makes me "tap-dance to work" is when we show people something new, like a computer that can recognize your handwriting or your speech, or one that can store a lifetime"s worth of photos, and they say, "I didn"t know you could do that with a PC!"
But for all the cool things that a person can do with a PC, there are lots of other ways we can put our creativity and intelligence to work to improve our world. There are still far too many people in the world whose most basic needs go unmet. Every year, for example, millions of people die from diseases that are easy to prevent or treat in the developed world.
I believe that my own good fortune brings with it a responsibility to give back to the world. My wife, Melinda, and I have committed to improving health and education in a way that can help as many people as possible.
As a father, I believe that the death of a child in Africa is no less poignant or tragic than the death of a child anywhere else and that it doesn"t take much to make an immense difference in these children"s lives.
I"m still very much an optimist, and I believe that progress on even the world"s toughest problems is possible—and it"s happening every day. We"re seeing new drugs for deadly diseases, new diagnostic tools, and new attention paid to the health problems in the developing world.
I"m excited by the possibilities I see for medicine, for education and, of course, for technology. And I believe that through our natural inventiveness, creativity and willingness to solve tough problems, we"re going to make some amazing achievements in all these areas in my lifetime.
单选题
下面有3篇短文,每篇短文后有5道题,每道题后面有4个选项。请根据文章的内容,从每题所给的4个选项中选择1个最佳答案。{{B}}第一篇{{/B}}
{{B}}Almost
Human?{{/B}} Scientists are racing to build the world's first
thinking robot. This is not science fiction: some say they will have made it by
the year 2020. Carol Packer reports. Machines that walk, speak
and feel are no longer science fiction. Kismet is the name of an android (机器人)
which scientists have built at the Massachusetts Institute of Technology (MIT).
Kismet is different from the traditional robot because it can show human
emotions. Its eyes, ears and lips move to-show when it feels happy, sad or
bored. Kismet is one of the first of a new generation of androids -- robots that
look like human beings -- which can imitate human feelings. Cog, another android
invented by the MIT, imitates the action of a mother. However, scientists admit
that so far Cog has the mental ability of a two-year-old. The
optimists (乐观主义者) say that by the year 2020 we will have created humanoids (机器人)
with brains similar to those of an adult human being. These robots will be
designed to look like people to make them more attractive and easier to sell to
the public. What kind of jobs will they do? In the future, robots like Robonaut,
a humanoid invented by NASA, will be doing dangerous jobs, like repairing space
stations. They will also be doing more and more of the household work for us. In
Japan, scientists are designing androids that will entertain us by dancing and
playing the piano. Some people worry about what the future
holds: will robots become monsters (怪物)? Will people themselves become
increasingly like robots? Experts predict that more and more people will be
wearing micro-computers, connected to the Internet in the future. People will
have micro-chips in various parts of their body, which will connect them to a
wide variety of gadgets (小装置). Perhaps we should not exaggerate (夸大) the
importance of technology, but one wonders whether, in years to come, we will
still be falling in love, and whether we will still feel pain. Who
knows?
单选题Anderson left the table,
remarking
that he had some work to do.
单选题Crystal Ear One day a friend asked my wife Jill if I wanted a hearing aid. "He certainly does," replied Jill. After hearing about a remarkable new product, Jill finally got up the nerve to ask me if I'd ever thought about getting a hearing aid. "No way," I said. "It would make me look 20 years older. " "No, no, " she replied. "This is entirely different. It's Crystal Ear! " Jill was right. Crystal Ear is different—not the old-styled body worn or over-the-ear aid, but an advanced personal sound system so small that it's like contacts (隐形眼镜) for your ears. And Crystal Ear is super-sensitive and powerful, too. You will hear sounds your ears have been missing for years. Crystal Ear will make speech louder, and the sound is pure and natural. I couldn't believe how tiny it is. It is smaller than the tip of my little finger and it's almost invisible when worn. There are no wires, no behind-the-ear device. Put it in your ear and its ready-to-wear mold (形状) fits comfortably. Since it's not too loud or too tight, you may even forget that you're wearing it! Use it at work or at play. And if your hearing problem is worse in certain situations, use Crystal Ear only when you need it. Hearing loss, which occurs typically prior to teenage years, progresses throughout one's lifetime. Although hearing loss is now the world's number one health problem, nearly 90 percent of people suffering hearing loss choose to leave the problem untreated. For many millions, treating hearing loss in a conventional way can involve numerous office visits, expensive testing and adjustments to fit your ear. Thanks to Crystal Ear, the "sound solution" is now convenient. Almost 90 percent of people with mild hearing loss, and millions more with just a little hearing drop-off (下降), can be dramatically helped with Crystal Ear. Moreover, its superior design is energy-efficient, so batteries can last months. Crystal Ear is now available to help these people treat their hearing loss with a small hearing amplifier (放大器).
单选题He Useized/U the opportunity to present his proposal to the teacher.
单选题Merge
the following two short sentences into one new sentence.