题目
题型：同步题难度：来源：
and writing paper.No notebooks, no textbooks, no test paper.Nor are there any pencils or pens, which
always seem to run out of ink at the critical moment.A"paperless classroom"is what more and more
schools are trying to achieve.
Students don"t do any handwriting in this class.Instead, they use palm size, or speciallydesigned
computers.The teacher downloads texts from Internet libraries and sends them to every student"s
personal computer.
Having computers also means that students can use the Web.They can look up information on any
subject they"re studying from maths to social science.
High school teacher Judy Herrell in Florida, US, described how her class used the Web to learn
about the war in Afganistan(阿富汗) over one year ago.
"We could touch every side of the country through different sites from the forest to refugee camps
(难民营), "she said."Using a book that"s three or four years old is impossible."
And exams can go online too.At a high school in Tennessee, US, students take tests on their own
computers.The teacher records the grades on the network for everyone to see and then copies them to
his own electronic grade book.
A paperless classroom is a big step towards reducing the waste of paper. High school teacher
Stephanie Sorrell in Kentucky US said she used to give about 900 pieces of paper each week to each
student.
"Think about the money and trees we could save with the computers, "she said. But, with all this
technology, there"s always the risk that the machines will break down. So, in case of a power failure or
technical problems, paper textbooks are still widely available for these hitech students.
1. What does the part of the last but one sentence in the first paragraph, "run out of ink at the critical
moment" mean?
A. Pens may not write welt at the critical moment.
B. Pens get lost easily, so you may not find them at the critical moment.
C. Pens may have little or no ink at the critical moment.
D. Pens use ink, while pencils don"t.
2. In a paperless classroom, what is a must?
A. Pens.
B. Computers.
C. Information.
D. Texts.
3. The high school teacher, Judy Herrell, used the example of her class to show that________.
A. the Web could take them everywhere
B. the Web taught them a lot
C. the Web is a good tool for information
D. the Web, better than the textbooks, can give the latest and comprehensive(全面的) information
4. The paperless classrooms will benefit ________ the most.
A. students
B. teachers
C. trees
D. computers
5. What does the phrase in the last paragraph, "break down", mean?
A. Break into pieces.
B. Stop working.
C. Fall down.
D. Lose control.
答案
核心考点
试题【阅读理解 Imagine a classroom missing the one thing that"s long been considered a】；主要考察你对题材分类等知识点的理解。[详细]
举一反三
people and animals, Scientists at Hebrew University in Jerusalem developed the sugary bait by combining
fruit juice oils and boric acid (硼酸). The fruit juice oils get the attention of the mosquitoes, and the boric
acid kills the insects when they eat it.
The scientists took the sweet boric acid bait to the West African nation of Mali. They sprayed (喷洒) it on the plants near the man-made ponds which are home to "Anopheles Gambiae", the mosquitoes that
carry the most deadly form of malaria (疟疾). The researchers also placed a sweet-smelling spray on the grasses near other ponds. But it contained no boric acid. Both of the substances also contained a
substance that would mark any mosquito that came in contact with the bait.In this way the scientists
could count the mosquitoes that fed on it. Yosef Schlein, an expert on the insects that affect human healh，led the sweet bait research. He says thirty-eight days of results show the sweet boric acid bait proved very effective in killing mosquitoes. At the ponds treated only with sweet-smelling bait, Professor Schlein says, more than seventy-five percent of mosquitoes fed on the false bait. He says most people do not know that female mosquitoes feed on sweet plant nectar to survive.
The Israeli researchers now hope to develop a bait that is even more desirable to the malaria
mosquitoes.
Boric acid is generally safe for human beings and other mammals. Professor Schlein says scientists
might be able to develop a mosquito bait for enclosed spaces. Boric acid has been used to kill other
insects, including cockroaches, termites and ants inside homes since the middle of last century.
B. It attracts the mosquitoes but fails to kill them most of the time.
C. It is actually created by Professor Schlein.
D. It is a mixture of fruit juice oils and boric acid.
B. The fruit juice oil.
C. A sweetsmelling spray with boric acid.
D. The sweet boric acid bait.
B. He is an expert on the substances that affect human health.
C. He thinks the sweet boric acid bait kills the malaria mosquitoes very effectively.
D. He thinks most people know female mosquitoes feed on sweet plant nectar to survive.
B. the new mosquito killer has been widely used in Africa.
C. malaria will become the most dangerous disease in the poorest areas of Africa.
D. the Israeli researchers want to develop a substance more attractive to the mosquitoes.
nightmare. Some parents try to get rid of half of the candy after their children go to bed, but dentists
say parents also need to separate the good kinds of treats from the bad ones.
It is not exactly what a child eats that truly matters, but how much time it stays in his mouth.
According to pediatric dentist Dr. Kaneta Lott, the most damaging stuff is something that is sticky or
very hard and thus stays in the mouth for a long time.This is because we all have bacteria in our mouths.
When we eat, the bacteria take our food as their food and produce an acid that destroys the surface
of the teeth, causing cavities to form. The longer the food stays in the mouth, the more likely cavities
will develop. Therefore, potato chips are worse than candy because they get stuck between teeth. For
the same reason, raisins and crackers are not the best choice. Hard candies take a long time to
consume and are also a bad choice for Halloween treats.
If children really love candy, dentists recommend that they eat chocolate instead. Unlike hard
candies, chocolate dissolves quickly in the mouth.Besides, chocolate contains tannins, which help to
kill some of the bacteria in the mouth.But no matter what a child eats, brushing after each meal is still
the best way to fight cavities.
B. To point out the problems with Halloween celebrations.
C. To tell parents what sweets are less damaging to their children’s teeth.
D. To teach parents the meaning of Halloween candy for their children.
B. They contain too much sugar.
C. They help bacteria to produce tannins.
D. They stay in the mouth for a long time.
B. Crackers.
C. Raisins.
D. Potato chips.
B. They help to get rid of some bacteria in the mouth.
C. They help chocolate to dissolve more quickly.
D. They destroy the surface of the teeth.
I have allergies(过敏反应). It feels like something is in my throat. What is it and what should I do to
help it?
Christa
Dear Christa:
You might be feeling mucous in your throat.The membranes there make mucus to keep nasal
passages(鼻腔)moist and clean and to warm the air that we breathe.But sometimes our bodies make
too much mucus, and it can collect at the back of the throat. Drinking lots of liquids, especially warm
ones, may help.
Dear Dr. Cory:
Sometimes when I don’t wear any socks with my shoes I get blisters(水疱). What are blisters? How
can I avoid them?
Jacy
Dear Jacy:
Blisters occur when something(like the back of your shoe)rubs against your skin and causes tiny
blood vessels to leak fluid(液体). The blister acts like a pillow to protect damaged skin while it repairs
itself.
The best way to prevent blisters is to avoid“rubbing”spots.If the problem is your shoes, wear socks
and shoes that fit to help prevent blisters.
Dear Dr. Cory:
I like reading your column. It tells me a lot about the body and how it works. I have a question for
you: I have not been airing my feet out lately and the bottoms of them have been turning crisp(起皱的)
and the skin is peeling. Why?
Aaron
Dear Aaron:
People whose feet get wet or sweaty while wearing shoes may develop athlete"s foot, caused by a
fungus that likes warm, damp skin. The fungus is easily passed from one person to another, so public
places such as locker rooms or showers are real hot spots. It"s most common during summer in people
who rarely remove their shoes, and in people who sweat a lot. It can cause bumps, redness, itching,
and peeling of the skin, often between the toes.
Anti-fungus cream, now available without a prescription(处方), cures the infection. Your doctor or
health care provider can help find the cause of the problem.
B. Let it be for it can repair itself.
C. Consult a doctor immediately.
D. Remove the mucus immediately.
B. Dr.Cory often writes some books about health.
C. Athletes are more likely to have foot problems.
D. You can cure infection without the help of doctors.
B. wearing suitable socks and shoes can prevent blisters
C. blood vessels will leak fluid if rubbed
D. the best way to cure blisters is to avoid rubbing spots
B. not airing his feet out
C. fungus
D. rarely removing his shoes
B. health problems
C. suggestions about diet
D. knowledge about medicine
health problems linked to being overweight.
The WHO says a major reason for the rising obesity rates is an increase in imported foods. It says
many Pacific islanders have replaced their traditional diets of vegetables and fruits with imported
processed foods.
Dr. Temu Waqanivalu is with the World Health Organization"s South Pacific office in Suva, Fiji. He
says many of the imported products lack nutritional value.
Temu Waqanivalu said: "In some of the places, you"d be amazed to see how a bottle of Coke is
cheaper than a bottle of water. I think that represents the kind of offenvironment we"ve created that
doesn"t really encourage or make lifestyle choices an easy choice for the population."
And a lack of physical activity among many Pacific islanders only adds to the obesity problem.
The WHO says more than 50 percent of the population is overweight in at least ten Pacific island
countries. The rate is as high as 80 percent among women in the territory of American Samoa. Fiji had
the lowest obesity rate at 30 percent.
In all, almost ten million people live in Pacific island countries. The WHO estimates that about 40
percent of them have health disorders related to diet and nutrition.
Diabetes rates are among the highest in the world. Fortyseven percent of the people in American
Samoa have diabetes. So do 44 percent of the people in Tokelau, a territory of New Zealand.
By comparison, the diabetes rate is 13 percent in the United States, a country that has its own
problems with rising obesity.
Officials also note an increase in nutritional problems like anemia and not enough vitamin A in the
diets of Pacific islanders. Dr. Waqanivalu says treating conditions related to obesity and diet puts
pressure on limited health resources and budgets.
B. the change of eating habits
C. the change of life style
D. lack of exercise
B. they are popular
C. they are tasty
D. they are convenient to get
B. 4 million.
C. 6 million.
D. 10 million.
B. steady
C. worrying
D. low
has reached its goal of banking 10 percent by 2010.
The Millennium Seed Bank Project, run by Kew Gardens-one of the oldest botanical gardens-will
officially deposit the 24,200th species on Thursday, a pink, wild banana from China.
More than 50 countries are now on board with Kew"s giant task but vast places of the globe,
including India and Brazil, still need to join in and donate seeds, director Paul Smith said.
The seed bank is one of the largest and most diverse in the world with more than 1.5 billion seeds.
Its goal is to help protect the planet"s biodiversity during a time of climate change.
The wild banana seed is under threat of extinction(灭绝)in Southwest China from agricultural
development.It is a vital food source for Asian elephants and important for growing bananas for human
consumption.
Stored at minus 20 degrees centigrade, the seeds can last for thousands of years and await the day
that scientists hope never comes-when the species no longer exist in the wild.
It is a race against time, Smith said, because in the last decade alone, 20 plants held in the bank have
already been wiped out in the wild. He estimates that between a third and a quarter will become extinct
this century.
"It is urgent and it is happening now. An area, the size of England, is cleared of primary vegetation
(植被)every year," Smith said.
Because most of the world"s food and medicines come from nature, protecting wild plant species is
quite important, scientists say. There are already many other seed banks safeguarding food crops, which
only account for 0.6 percent of plant diversity.
For Kew"s next goal-to collect a quarter of wild varieties by 2020-the botanists need 10 million
pounds a year, or a further 100 million pounds on top of the 40 million they have already been granted.
B. To safeguard food crops.
C. To protect wild plants from extinction.
D. To help scientists study wild plants.
B. the climate change in this area
C. the large number of Asian elephants
D. human"s large consumption
B. India and Brazil haven"t joined in the Seed Bank Project at present
C. there is only one seed bank in the world at present
D. the wild plants in places like India and China will never die out
B. The Millennium Seed Bank Project.
C. Britain"s seed bank.
D. Kew Gardens" next goal.
B. The temperature condition of the conservative wild plant species.
C. The government"s financial support for the seed bank project.
D. Scientists" concern on the extinct wild plant species.
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