题目内容
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We know very little about the central Africa 200 years ago because______.
A．there was nothing worth Being written down at that time
B．the people there don't pay attention to the importance of keeping a record
C．the written records were perhaps destroyed by a fire
D．the people there did not know how to write
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更多“We know very little about the …”相关的问题
A.often
B.little
C.young
D.well
But my own worry today is less that of the overwhelming problem of elemental literacy than it is of the slightly more luxurious problem of the decline in the skill even of the middle-class reader, of his unwillingness to afford those spaces of silence, those luxuries of domesticity and time and concentration, that surround the image of the classic act of reading, it has been suggested that almost 80 percent of America's literate, educated teenagers can no longer read without an accompanying noise (music) in the background or a television screen flickering at the corner of their field of perception. We know very little about the brain and how it deals with simultaneous conflicting input, but every common-sense intuition suggests we should be profoundly alarmed. This violation of concentration, silence, solitude goes to the very heart of our notion of literacy; this new form. of part-reading, of part-perception against background distraction, renders impossible certain essential acts of apprehension and concentration, let alone that most important tribute any human being can pay to a poem or a piece of prose he or she really loves, which is to learn it by heart. Not by brain, by heart; the expression is vital.
Under these circumstances, the question of what future there is for the arts of reading is a real one. Ahead of us lie technical, psychic, and social transformations probably much more dramatic than those brought about by Gutenberg, the German inventor in printing. The Gutenberg revolution, as we now know it, took a long time; its effects are still being debated. The information revolution will touch every fact of composition, publication, distribution, and reading. No one in the book industry can say with any confidence what will happen to the book as we've known it.
The picture of the reading ability of the American people, drawn by the author, is ______.
A．rather bleak
B．fairly bright
C．very impressive
D．quite encouraging
So why is this huge increase in population taking place？ It is really due to the spread of the knowledge and practice of what is becoming known as "Death Control". You have no doubt heard of the term "Birth Control". "Death Control" is something rather different. It recognizes the work of the doctors and scientists who now keep alive people who, not very long ago, would have died of a variety of then incurable diseases. Through a wide variety of technological innovations that include farming methods and the control of deadly diseases, we have found ways to reduce the rate at which we die. However, this success is the very cause of the greatest threat to mankind.
If we examine the amount of land available for this ever-increasing population, we begin to see the problem. If everyone on the planet had an equal share of land, we would each have about 50,000 square meters. This figure seems to be quite encouraging until we examine the amount of usable land we actually have. More than three-fifths of the world's land cannot produce food.
Obviously, with so little land to support us, we should be taking great care not to reduce it further. But we are not! Instead, we are consuming its "capital" — its nonrenewable fossil fuels and other mineral deposits that took millions of years to form. but which are now being destroyed in decades. We are also doing the same with other vital resources not usually thought of as being nonrenewable such as fertile soils, groundwater and the millions of other species that share the earth with us.
It is a very common belief that the problems of the population explosion are caused mainly by poor people living in poor countries who do not know enough to limit their reproduction. This is not true. The actual number of people in an area is not as important as the effect they have on nature. Developing countries do have an effect on their environment, but it is the populations of richer countries that have a far greater impact on the earth as a whole.
According to the article, what contributes to the population increase？
A．Birth explosion.
B．Birth Control.
C．Technological innovations.
D．Death Control.
A. But Komfeld said scientists will not know about the applicability of the drugs in humans until a similar study is done on humans. “What’s very encouraging is that these drugs were developed to treat humans, and they are well understood, because they’ve been used for a long time, ” he said。
B. Later the scientists discovered that two related anticonvulsant drugs also lengthened the lives of the worms-in the case of one drug, by almost 50 percent. “This was a big surprise to use, Komfeld said. ”“We didn’t think anticonvulsant drugs had any particular relationship to aging. That connection was completely unexpected. ”
C. Roundworms are a poor subject for experiments, because they are not like humans, even though their molecules are similar. For example, they have no bones, nor do they show emotions, making it difficult to know how exactly human subjects would react to these drugs in large quantities. However, using the worms allows experiments to be conducted quickly, because they do not live for long。
D. “Somehow the neural activity seems to regulate the aging of all of the body the skin, musculature, and reproductive tract, ” Kornfeld said. “Somehow the nervous system coordinates the progress of all these tissues, evidently, though the life stages. But we don’t know how it does that. ”
E. The discovery may also shed light on the little-understood aging process. Since the drugs act on the neuromuscular systems of both humans and worms, the findings hint at a link between neural activity and aging。
F. Unlike vertebrates, the worms are ideal subjects for the study of aging because of their short life spans, which last only a couple of weeks in a laboratory. The worm is well known in genetics, and the worm’s genome has been sequenced。
G. Use of this drug has been permitted by law since 1998 and wider use is now expected as a result of the studies. “We can clearly link this drug with human aging, but we still need to find proof, says Kornfeld optimistically. ”
Last summer I found, in the rock garden, a tiny little plant that I could not immediatelyrecognize. I knew I didn&39; t plant it and Denise said she didn&39; t either. We decided to let it continuegrowing until we could find out what it was.
Weeks passed and as I made my way back to the strange plant, it appeared to&39;be a sunflower. Itlooked thin and tall with only one head on it. I decided to baby it along and weed(除草) around it.As I pulled rocks from the area to get to the weeds, I noticed something unusual. The sunflower hadnot started where I saw it begin. It actually had begun under a big rock and grown under and around it to reach the sun.
If a tiny little sunflower didn&39; t let a big rock stand in its way of developing, we too have theability to do the same thing. If we believe in ourselves like that little sunflower, we can reach wherewe aim to go and get what we need for growth.
We need to believe in ourselves knowing we have the ability to achieve our goals. Like thesunflower, it knew it had the ability to get over the rocks because it had faith in itself that it wouldsucceed. Stand tall like the sunflower and be proud of who and what we are,then other things will beginto support us. We will find a way to go under or around any "rocks" in order to realize our goals.
Why did the family plant flowers in the "rock garden"？
A.To attract visitors.
B.To remove the rocks.
C.To please their neighbors.
D.To make the area colorful.
The author let the tiny plant continue growingA.to see how long it could live
B.to see how big it could grow
C.to find out what it actually was
D.to know if his wife had planted it
Why did the author think the sunflower was unusual？A.It was very thin and tall.
B.It had only one head on it.
C.It grew on top of a big rock.
D.It began to grow under a rock.
What does the author want to say through the story？A.Rocks cannot prevent us from success.
B.Sunflowers are able to grow everywhere.
C.We should take good care of the rock gardens.
D.We can get over difficulties if we trust ourselves.
请帮忙给出每个问题的正确答案和分析，谢谢！
"Cool" is a word with many meanings. Its old meaning is used to express a temperature that is a little bit cold. As the world has changed, the word has had many different meanings.
"Cool" can be used to express feelings of interest in almost anything. When you see a famous car in the street, maybe you will say, "It's cool. ' You may think, "He's so cool," when you see your favorite football player.
We all maximize (扩大) the meaning of "cool". You can use it instead of many words such as "new" or "surprising". Here's an interesting story we can use to show the way the word is used. A teacher asked her students to write about the waterfall (瀑布) they had visited. On one student's paper was just the one sentence, "It's so cool." Maybe he thought it was the best way to show what he saw and felt.
But the story also shows a scarcity of words. Without "cool", some people have no words to show the same meaning. So it is quite important to keep some credibility (可信性). Can you think of many other words that make your life as colorful as the word "cool"？ I can. And I think they are also very cool.
We know that the word "cool" has had______.
A．only one meaning
B．no meanings
C．the same meaning
D．many different meanings
A．So far as
B．So long as
C．As well as
D．As long as
A．considerate...wouldn't have begun
B．inconsiderate...would have begun
C．considerable...wouldn't have begun
D．inconsiderable...wouldn't begin
Fairy tales were not always intended for children.We know this because some of these stories have existed for hundreds of years and were passed down from generation to generation through songs and drama.They were considered entertainment for everyone, not only for young people.In these ancient stories, the heroes were extremely clever, fiercely independent, and never gave up.Over the years, some of the heroes’ qualities and story lines have been changed to fit the times. Psychologists think that fairy tales have a positive influence on children because they present the two sides of good and evil very clearly.When children hear the stories, they develop sympathetic feelings for the heroic characters.In each tale, they can see that there are many different kinds of people in the world and that we all have a choice about what kind of person we want to be.We can choose to do good actions, rather that bad ones, in our lives.
What kind of values can children learn from fairy tales？ In “The Princess and the Pea,” a poorly dressed girl who insists she is a princess is given a difficult test by the Queen.When she passes the test, we learn that she is rewarded because she stayed true to herself.In “The Little Mermaid,” the mermaid(美人鱼)who lives under the sea longs to be with the humans on land.Through her experiences, we learn about the importance of living with and accepting other cultures.In “Pinocchio,” a wooden puppet(木偶)turns into a boy when he finally learns how to tell the truth. Teaching values is the reason most often given for teaching literature and encouraging reading.These old stories can indeed teach us lessons about human relationships that are universal(普遍的) enough to survive throughout the centuries.This might be the reason why they have been around for so long and are unlikely to disappear any time soon.
1.What do we learn about fairy tales from the passage？ _______
A.They are written solely for children
B.They teach universal lessons about human relationships
C.They are all passed down through songs and drama
D.They are adapted to TV and movies as entertainment
2.Why do fairy tales have a positive influence on children？
A.Good and evil are presented in way they can easily understand
B.The characters are all good examples for them to follow
C.The heroes go through all kinds of hardships but never give up
D.There are many different kinds of characters for them to imitate
3.Some of the heroes’ qualities in fairy tales have been changed over the years ________.
A.to reflect the change of values
B.to suit the tastes of different people
C.to arouse the interest of little children
D.to adapt to the change of the times
4.Children who have heard about the story of the little mermaid might ________.
A.learn to be better self-disciplined
B.be more likely to tell the truth than to tell lies
C.learn to stay true to themselves all their lives
D.be better able to accept foreign cultures
5.Parents encourage children to read fairy tales so that they ________.
A.can entertain themselves without bothering others
B.can get to know great literature of the world
C.can stay away from violence shown on TV
D.can learn how to behave in society
