male has a light-coloured patch on its plumage (鸟羽) which acts as signal for drawing the female"s
attention to a suitable nesting-place. Unlike the blue tit, the redstart (红尾鸲) may be only the male that
strikingly coloured and the female is not beautiful.
A few years ago I was lucky enough to spot a pair of redstarts in action in a Walsh wood. The male
was leading an interested female to holes that he had previously (先前) checked out. He sat at the
entrance of each hole and put his head on to show off his white forehead, or his head in to reveal (显露)
his tail.
If the female failed to react to his visual signals, the male sometimes sang for extra effect, while gliding towards her on spread wings and tail. Once the female accepts by following the male through the hole the
displays stop, you must be at the right place at the right time to watch them.
B. The male chooses their nest.
C. The house-hunter chooses their nest.
D. The female chooses their nest.
B. how an interested female played with the male happily
C. what the male displayed and won the female
D. that the male tried his best but failed to attract the female
B. regularly
C. in April
D. occasionally
4. The writer is probably _____.
B. a bird-hunter
C. a bird raiser
D. a scientist
researchers have been undertaking for the past five years in a project called "Noah"s Ark". Noah"s Ark is
aimed at collecting eggs, embryos (胚胎), semen and DNA of endangered animals and storing them in
liquid nitrogen. If certain species should become extinct, Dr. Duane Kraemer, a professor in Texas
A & M"s College of Veterinary Medicine, says there would be enough of the basic building blocks to
reintroduce the species in the future.
It is estimated that as many as 2, 000 species of mammals, birds reptiles will become extinct in over
100 years. The panda, native only to China, is in danger of becoming extinct in the next 25 years.
This week, Chinese scientists said they grew an embryo by introducing cells from a dead female panda
into the egg cells of a Japanese white rabbit. They are now trying to implant the embryo into a host
animal.
The entire procedure could take from three to five years to complete.
"The nuclear transfer (核子移植) of one species to another is not easy, and the lack of available
(capable of being used) panda eggs could be a major problem," Kraemer believes. "They will probably
have to do several hundred transfers to result in one pregnancy (having a baby). It takes a long time and
it"s difficult, but this could be groundbreaking science if it works. They are certainly not putting any live
pandas at risk, so it is worth the effort," adds Kraemer, who is one of the leaders of the Project at Texas
A& M, the first-ever attempt at cloning a dog.
"They are trying to do something that"s never been done, and this is very similar to our work in
Noah"s Ark. We"re both trying to save animals that face extinction. I certainly appreciate their effort and
there"s a lot we can learn from what they are attempting to do. It"s a research that is very much
needed."
B. save endangered animals from dying out
C. collect DNA of endangered animals to study
D. transfer the nuclear of one animal to another
B. host animals
C. qualified researchers
D. enough money
B. The First Cloned Panda in the World
C. Exploring the Possibility to Clone Pandas
D. China -the Native Place of Pandas Forever
B. scientists try to implant a panda"s egg into a rabbit
C. Kraemer will work with Chinese scientists in clone researches
D. about two thousand of species will probably die out in a century
"I think we are knowing at the door of immortality (永生)." said Michael Zey, a Montclair State
University business professor and author of two books on the future. "I think by 2075____________________________ and that"s a conservative estimate (保守估计的).”
At the conference in San Francisco, Donald Louria, a professor and author at New Jersey Medical
School in Newwark said advances in using genes as well as nanotechnology (纳米技术) make it likely
that humans will live in the future beyond what has been possible in the past. "There is a great push so that people can live from 120 to 180 years." He said. "Some have suggested that there is no limit and that
people could live to 200 or 300 or 500 years."
However, many scientists who specialize in aging are doubted about it and say the human body is just
not designed to last past about 120 years. Even with healthier lifestyles and less disease, they say failure of the brain and organs will finally lead all humans to death.
Scientists also differ on what kind of life the super aged might live. "It remains to be seen if you pass
120, you know; could you be healthy enough to have good quality of life?" said Leonard Poon, director of the University of George Gerontology Centre. "At present people who could get to that point are not in
good health at all."
_______________________________________________________________________________
2. Which sentence in the passage can be replaced by the following one? We have got some ideas about living longer.
_______________________________________________________________________________
3. Please fill in the blank in the second paragraph with proper words or phrases to complete the sentence. (Pease answer with 10 words)
_______________________________________________________________________________
4. Do you think it is possible for humans to live longer in the future? (Please answer within 30 words)
_______________________________________________________________________________
5. Translate the underlined sentence in the last paragraph into Chinese.
_______________________________________________________________________________
of lung cancer among smokers. A new study shows that black people and Native Hawaiians are more
likely to develop lung cancer from smoking. It compared their risk to whites, Japanese-Americans and
Latinos.
Researchers at the University of Southern California and the University of Hawaii did the new study.
The New England Journal of Medicine published the findings. The eight-year research studied more than
180,000 people. They included present and former smokers and people who never smoked. Almost
2.000 people in the study developed lung cancer.
Researchers say genetics(遗传学) might help explain the racial and ethnic(种族的) differences.
There could be differences in how people"s bodies react to smoke. But environmental influences,
including the way people smoke, could also make a difference.
African-Americans and Latinos in the study are reported smoking the fewest cigarettes per day.
Whites are the heaviest smokers. But the scientists point out that blacks have been reported to breathe
cigarette smoke more deeply than white smokers. This could fill their lungs with more of the chemicals
in tobacco that cause cancer.
Scientists know that some diseases effect different groups differently. And some drug companies
have begun to develop racially targeted(针对) medicines. Last June, the United States Food and Drug
Administration approved a drug designed to treat heart failure in black patients. The name is BiDil. The
agency called it "a step toward the promise of personalized medicine."
B.Africans-Americans-Latinos
C.Asians-Native Hawaiians
D.Africans-Americans-Native Hawaiians
B.the living style or habit of the blacks
C.the depth of cigarette smoke into their lungs
D.the physical strength to react to cigarette smoke
B.the black and white people
C.the Asians and Hawaiians
D.smokers and non-smokers
B.tell the readers that racial differences exist in smokers
C.show a big step people have taken in the medicine area
D.support the idea that it is easy for blacks to have cancers
B.Race has nothing to do with the risk of having a lung cancer.
C.The research was started by the New England Journal of Medicine.
D.The risk of lung cancer lies I how much a person smokes.
old, short and tall, thin and fat. It is everybody"s second language. It is easy to understand, although you
can"t hear it. It is sign language.
When you wave to a friend who is across the street, you are using sign language. When you smile at someone, you are saying, "I want to be friendly", but you are not using speech. You are using sign language. When you raise your hand in class, you are saying, "Please ask me. I think I know the correct answer."
Babies who can"t talk can point at things. They are using sign language. A policeman who wants to
stop traffic holds up his hands. He is using sign language.
Many years ago, a French priest, Charles Michel de Epee, became interested in education for deaf
people. He invented a finger alphabet (字母表). It is still in use. People can make the sign for letters and
spell words with their hands, and deaf people can read and understand them. Soon there were schools for the deaf in many countries. The only university for the deaf is Gallaudet College in Washington, D.C.
Today, in the United States, there are special TV news programs for deaf people. The newsreader tells the news in sign language. At the same time, the words appear on the TV screen.
The actors in the Theatre of Deaf don"t spell every word. Sometimes they use hand signs. When they
put two hands together, it means sandwich. They can make a roof with their hands when they want to
show a house. One finger in front of an actor"s mouth can mean quiet. You can talk to people who are
behind windows that are closed. And when you go swimming with your friends, you can have
conversations under water.
How many hand signs do you use every day?
B. It is a way to express one"s ideas without words.
C. It is only used by the deaf.
D. It can be heard.
B. put one hand onto the other
C. smile to the person
D. make a roof with your hands
B. There are schools, colleges and universities for the deaf in the USA.
C. The French priest Charles invented sign language.
D. Even babies are using sign language.
B. the importance of sign language
C. a famous priest in France
D. how to use sign language
The gift of being able to describe a face accurately is a rare one, as every experienced police
officer knows to his cost. As the Lancet put it recently, "When we try to describe faces precisely,
words fail us, and we resort to identikit (拼脸型图) procedures."
Yet, according to one authority on the subject, we can each probably recognize more than
1,000 faces, the majority of which differ in fine details. This, when one comes to think of it, is a
tremendous feat, though, curiously enough, relatively little attention has been devoted to the
fundamental problems of how and why we acquire this gift for recognizing and remembering faces.
Is it an inborn property of our brains, or an acquired one? As so often happens, the experts tend
to differ.
Thus, some argue that it is inborn, and that there are "special characteristics about the brain"s
ability to distinguish faces". In support of this, they note how much better we are at recognizing a
face after a single encounter than we are, for example, in recognizing an individual horse. On the
other hand, there are those, and they are probably in the majority, who claim that the gift is an
acquired one.
The arguments in favor of this latter view, it must be confessed, are impressive. It is a habit that
is acquired soon after birth. Watch, for instance, how a quite young baby recognizes his mother by
sight. Granted that his other senses help - the sound, his sense of smell, the distinctive way she
handles him. But of all these, sight is predominant. Formed at the very beginning of life, the ability
to recognize faces quickly becomes an established habit, and one that is, essential for daily living,
if not necessarily for survival. How essential and valuable it is we probably do not appreciate until
we encounter people who have been deprived of the faculty.
This unfortunate inability to recognize familiar faces is known to all, but such people can often
recognize individuals by their voices, their walking manners or their spectacles. With typical human
ingenuity, many of these unfortunate people overcome their handicap by recognizing other
characteristic features.
B. the ability to recognize faces unhesitatingly is an unusual gift
C. quite a few people can visualize faces they have seen
D. few people can give exact details of the appearance of a face
B. people don"t think much of the problem of how and why we acquire the ability to recognize and
remember faces
C. people don"t realize how essential and valuable it is for them to have the ability to recognize faces
D. people have been arguing much over the way people recognize and remember faces
B. It is acquired soon after birth.
C. It is something we can do from the very moment we are born.
D. It is learned from our environment and experiences.
B. sight is indispensable (必需的) to recognizing individuals
C. the ability to recognize faces is a special inborn ability of the brain
D. the importance of the ability of recognizing faces is fully appreciated by people.
- 1一质点沿直线运动,若由始点起经过t秒后的位移为,那么速度为0的时刻为[ ]A.0秒 B.1秒末 C.2秒末 D.
- 2只用酚酞试液就能鉴别的一组是[ ]A.NaOH、Ca(OH)2、HCl B.NaOH、H2SO4、NaCl C.
- 3已知弧的长为3πcm,弧的半径为6cm,则圆弧的度数为______.
- 4如果一个自然数右边的数字比左边的数字大,那么我们把它叫做“上升数”(如34,569,1269等都是上升数),现在任取一个
- 5在下列常用词语中字形完全正确的一项是A.愤愤不平呶呶不休珠连璧合B.旁征博引嗔怪缜密备受亲睐C.伶牙俐齿群贤必至共商国是
- 6如图表示叶的平面结构和叶在夏季一天中进行物质转化的两种生命活动情况.请分析回答:(1)图中曲线a表示的生命活动是____
- 7若|3a+b+5|+(a﹣b﹣1)2=0,则2a2﹣3ab的值是( ).
- 8下列词语中没有错别字的一组是[ ]A.高屋建邻 锐不可当 弃城逃窜 纯朴勤劳B.纷纷溃退 张皇失措 转
- 9下列动物中,属于我国特产珍稀哺乳动物的一组是[ ]A.金丝猴、大熊猫、扭角羚B.大熊猫、长颈鹿、大鲵C.扬子鳄、
- 10体积为V的油滴,落在平静的水面上,扩展成面积为S的单分子油膜,则该油滴的分子直径约为________ 。已知阿伏加德罗常
- 1氢原子从其他能级向量子数为2的能级跃迁时所产生的光谱称为巴尔末系,其波长λ遵循以下规律:1λ=R(122-1n2),对此
- 2《过零丁洋》文天祥辛苦遭逢起一经,干戈寥落四周星。山河破碎风飘絮,身世浮沉雨打萍。惶恐滩头说惶恐,零丁洋里叹零丁。人生自
- 3.观察下列算式: ……用你所发现的规律计算…… _____________。
- 4下图是一个德国人阐释的中国人与德国人表达个人观点的方式,这背后体现的是东、西方文化的差异,对此认识正确的是( )德国
- 5如图所示,有一边长为8米的正方形大厅,它是由黑白完全相同的方砖密铺而成.求一块方砖的边长.
- 6Follow your teacher’s advice, _______ you’ll make great prog
- 7已知向氯酸钠的酸性水溶液中通入二氧化硫气体,反应中SO2氧化过程为:SO2+2H2O –2e- =SO42-+4H+;向
- 8“从前皇帝自称为天子,如果有人说皇帝是强盗,可以打倒,别人一定把他看作疯子。孙中山就曾经是一个被人家看作是疯子的人。相反
- 92005年我国财政收入保持良好增长趋势,首次突破3万亿元。与此同时,国家用于经济建设等各项事业的支出也同步增长。这说明A
- 10I would like to do it_____I like it.A.sinceB.becauseC.becaus