The humans are destroying nature day by day, of course,will cause severe punishment from it sooner or later. A.who B.when C.on which D.Which 题目和参考答案——青夏教育精英家教网—

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The humans are destroying nature day by day,__________of course,will cause severe punishment from it sooner or later.

A.who B.when C.on which D.Which

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Can people change their skin colour without suffering like pop king Michael Jackson? Perhaps yes. Scientists have found the gene that determines skin colour.

The gene comes in two versions, one of which is found in 99 per cent of Europeans. The other is found in 93 to 100 per cent of Africans, researchers at Pennsylvania State University report in the latest issue of Science.

Scientists have changed the colour of a dark-striped zebrafish to uniform gold by inserting a version of the pigment(色素) gene into a young fish. As with humans, zebrafish skin colour is determined by pigment cells, which contain melanosomes(黑色素). The number, size and darkness of melanosomes per pigment cell determines skin colour.

It appears that, like the golden zebrafish, light-skinned Europeans also have a mutation(变异) in the gene for melanosome production. This results in less pigmented skin.

However, Keith Cheng, leader of the research team, points out that the mutation is different in human and zebrafish genes.

Humans acquired dark skin in Africa about 1.5 million years ago to protect bodies from ultra-violet rays of the sun(太阳光紫外线), which can cause skin cancer.

But when modern humans leave Africa to live in northern latitudes, they need more sunlight on their skin to produce vitamin D. So the related gene changes, according to Cheng.

Asians have the same version of the gene as Africans, so they probably acquired their light skin through the action of some other gene that affects skin colour, said Cheng.

The new discovery could lead to medical treatments for skin cancer. It also could lead to research into ways to change skin colour without damaging it like chemical treatment did on Michael Jackson.

51. The passage mainly tells us that ________.

A. people can not change their skin colour without any pain

B. the new discovery could lead to search into ways to change skin colour safely

C. pop king Michael Jackson often changed his skin colour as he liked

D. scientists have found out that people’s skin colour is determined by the gene

52. It can be inferred from the passage that ________.

A. nowadays people who want to change their skin colour have to suffer a lot from the damage caused by the chemical treatment

B. Europeans and Africans have the same gene

C. the new discovery could help to find medical treatments for skin cancer

D. there are two kinds of genes

53. Scientists have done an experiment on a dark-striped zebra fish in order to ________.

A. find the different genes of humans’

B. prove the humans’ skin colour is determined by the pigment gene

C. find out the reason why the Africans’ skin colour is dark

D. find out the ways of changing peopl’s skin colour

54. The reason why Europeans are light-skinned is probably that ________.

A. they are born light-skinned people

B. light-skinned Europeans have mutation in the gen for melanosome production

C. they have fewer activities outside

D. they pay much attention to protecting their skin

55. The writer’s attitude towards the discovery is ________.

A. neutral B. negative C. positive D. indifferent

The world of the science-fiction 3-D film Avatar is so perfect that the line between fact and fiction has become somewhat blurred (模糊) .
Movie-goers have admitted being annoyed by depression at not being able to visit the planet Pandora. Set in the future when Earth's resources have been used up, director James Cameron's film tells the story of a company trying to exploit a rare mineral on a new planet. The humans clash with the natives — a peace-loving race of 7-foot-tall, blue-skinned creatures called the Na'vi, who exist in perfect harmony with nature.
Fans have flooded the Internet with their confused feelings. On the site Avatar Forums (论坛), the topic "Ways to deal with the depression of the dream of Pandora not being able to come true" has more than 1,000 posts. In a similar forum, Louis, one user, wrote: "When I woke up this morning after watching Avatar for the first time yesterday, the world seemed grey. It just seems so meaningless. I still don't really see any reason to keep doing things at all. I live in a dying world." On the Avatar site Naviblue, a fan calling himself Jorba has even asked others to join him in starting a real Na'vi tribe.
This fantasy world, with its wonderful plants and animal life, is brought to life by using impressive special effects. Many people believe that 2010 is the breakthrough year for the technology helped by 3-D movies such as Avatar. "It has taken the best of our technology to create this virtual world and real life will never be as perfect as it seems on screen. It makes real life seem more imperfect."
66. What is the best title of the text?
A. A blockbuster movie: Avatar
B. The Avatar effect: movie-goers feel depressed after watching Avatar
C. 2010: a breakthrough year for. 3-D movies
D. Pandora: a perfect world
67. We can infer that Louis___________after watching the film Avatar.
A. will cherish his present life more
B. feels disappointed about the real world
C. will intend to create a real Na'vi tribe
D. is proud of living on the earth
68. Thanks to the success of Av'atar, ___________.
A. 3-D technology will probably develop quickly in 2010
B. most people look forward to living on another planet
C. many more science-fiction films will be made in the coming years
D. people have become more realistic about life
69. The underlined word "virtual" probably means___________.
A. unreal         C. true         B. perfect       D. practical
70. According to the passage the natives on the planet are___________
A. not harmony with the nature    B. blue-haired race
C. peace-loving creatures         D. fond of fighting with human race

If your idea of a good time is to sleep in a hut, carry your own rubbish, and eat insects and wild animals, then ecotourism may be just for you. But is it also for people who want to fly over a rainforest sky before checking into a comfortable and expensive hotel in the middle of a national park? Whatever ecotourism is, it is hot--perhaps too hot for its own good.

The World Tourism Organization claims that the industry looked after 592 million travelers last year who spent $423 billion, and of all the types of tourism, ecotourism seems to be the fastest growing. By the broadest measure -- a trip with some sort of nature or wilderness element -- ecotourism already accounts for perhaps a third of these travelers. On a stricter definition favored by the Ecotourism Society, it is “responsible travel that preserves natural environments and keeps up the well-being of local people,” which accounts for no more than 5% of tourism.

Ideally, ecotourism helps both people and nature. Before the disastrous civil war, Rwanda’s Mountain Gorilla Project was one such model. Visits to the gorillas were limited, local guides ensured good behavior or on the part of the humans, and the high admission charge - $170 a day -- paid for salaries and presentation of the gorillas’ living areas. As this made the gorillas worth more alive than dead, poaching (偷猎) decreased. As another example, preservation Cooperation, Africa’s largest ecotour operator, uses only local labor, buys products 5om local farmers, and supports building projects: such as clinics and schools. This contribution to social advance is also good business sense. Projects from which local people benefit directly are less likely to be affected by poaching and theft.

Ecotourism’s biggest problem is labeling. Going on an eco-tour is no guarantee of good ecology. So far, only Australia has an official system to grade tour operators and tourist attractions on the basis of their “greenness”. Another issue is how eco-tourists damage the environment. Dolphin-feeding, for instance, is innocent and enjoyable, but after too many free meals, the dolphins forget how to catch their own dinners.

Keeping prices high is one way to limit enthusiasm. But measuring the effect of ecotourism on human environments is trickier. It is common, for villagers to see ecotourism as a source of new income. Hence, the very tourists who venture in search of traditional cultures end up breaking them up. As ecotourism becomes more popular, it will finally threaten the very things that are good for business.

1.According to the passage, ecotourism may _________.

A. harm its own purpose by becoming too popular

B. save the environment by becoming more popular

C. harm its own purpose by becoming less popular

D. save the environment by becoming less popular

2.Within the tourism industry as a whole, ecotourism _____________.

A. has no single, clear definition that would satisfy everybody

B. has expanded less rapidly than other types of tourism

C. claims that no comfortable hotels should be used by tourists

D. most often has a negative effect on local culture

3.Rwanda’s Mountain Gorilla Project is a good example because ___________.

A. tourists were free to visit the gorillas whenever they wanted to

B. local people’s attitudes toward animals were not affected

C. the gorillas were protected from both tourists and local people

D. the gorillas’ living area was modernized because of the high admission

4. _________ most directly benefits the local community.

A. Rwanda’s Mountain Gorilla Project B. Preservation Corporation

C. Australia’s grading system D. Dolphin-feeding

Technology: Taking the good without the bad?

Very soon, unimaginably powerful technologies will remake our lives．This could have dangerous consequences, especially because we may not even understand the basic science underlyi ng them．There’s a growing gap between our technological capability and our basic scientific understanding．We can do very clever things with the technology of the future without necessarily understanding some of the science underneath, and that is very dangerous．

The technologies that are particularly dangerous over the next hundred years are nanotechnology （纳米技术）, artificial intelligence and biotechnology．The benefits that they will bring are beyond doubt．But they are going to be very, very dangerous．I’m working in the field of artificial intelligence．I have a model design for something that might be 50,000 million times smarter than the human brain．Target date is 2010．The only thing that's not possible in the film Terminator（终结者） is that the people win．If you're fighting against technology w hich is 50,000 million times smarter than you, you probably will not win．

Nanotechnology．We've all heard of the grey glue problem, that self-replicating nanotech devices might keep on copying until the world has become sticky glue．And certainly in biotechnology, we've really got a big problem because it's converging with nanotechnology and IT．Once you start mixing nanotech with organisms and you start feeding nanotech-enabled bacteria, we can really go an awful lot further than the Borg in Star Trek（星际迷航）．And those superhuman organisms might not like us very much．

Eventually these technologies will become routine．That’s a threat to humanity．I don’t think it’s possible to slow it down．So what we need to do is accelerate the scientific research and try to get some extra tools．The problems facing us in the future are getting bigger and bigger．I think if we don’t get some proper science done, the future is hopeless indeed．

1.From the text, we know that the author’s greatest concern is ．

A．our lack of technological understanding of the process involved

B．our lack of technological capability

C．creating technology without really understanding the basic science

D．Our refusal to face the consequences of the technology we create

2.It can be inferred from the text that the author ．

A．thinks people overvalue the capabilities of technology

B．is not optimistic that artificial intelligence will always be used positively

C．thinks that we should take science fiction movies more seriously

D．believes artificial intelligence is the greatest threat we face technologically

3.Why does the author say it is not possible in the film Terminator that the humans win?

A．Because the power of the technology is exaggerated（夸大）．

B．Because the strength of the machines is much greater．

C．Because machines with that much intelligence can easily defeat humans．

D．Because human beings are not courageous enough to win the battle．

New research at Yale University has provided the strongest evidence that humans are evolving（进化）- and suggests that women of the future will be shorter, heavier, and healthier, and will have children for longer.

As medicine has allowed people who would previously have died young to live to childbearing age and beyond, many have assumed that natural selection no longer works on our species. But Prof Stephen Stearns, the evolutionary biologist at Yale University behind the study, says: "That's just plain false." While survival to reproductive age（生育年龄） is no longer such a barrier（障碍） for humans, other evolutionary pressures – including sexual selection and reproductive fitness – are still working away in full force. If the trends the research detected are representative and continue for another 10 generations, Prof Stearns says that the average woman in 2409AD will be 2cm shorter and 1kg heavier, will bear her first child five months earlier.

Prof Stearns and his team studied the medical histories of 14,000 residents of the Massachusetts town of Framingham, using medical data from a study going back to 1948 and spanning three generations. It looked at 2,238 women past reproductive age – so that they had had all the children they were going to – and tested their height, weight, cholesterol（胆固醇）, blood pressure, and other traits, to see if there was a correlation with the number of children they had borne. It found that shorter, heavier women had more children than lighter, taller ones. Women with lower blood pressure and cholesterol were also more likely to have large families. Women who gave birth early or had a late menopause were likely to have more children as well. More importantly, however, these traits were then passed on to their daughters, who also, on average, had more children.

The study has not determined why these factors are linked to reproductive success, but it is likely that they indicate genetic, rather than environmental, effects. Prof Stearns’ team controlled for other factors, including social and cultural change.

Research suggesting humans are evolving has been carried out before, but this is believed to be the first that directly compares reproductive success of individuals with physiological changes（生理变化）.

72. What is the main idea of the passage?

A. Natural selection no longer works on our species, especially the woman.

B. Woman of the future will be shorter, heavier, and healthier, and will have children for longer

C. Some genetic, rather than environmental effects has more influence on the evolvement of the humans.

D. Evolutionary pressures are still working in full force on the evolvement of the humans.

73. Which of the following statements is False about the women’s evolvement according to the research?

A. women will shorter

B. women will be fatter

C. The time for the women to have baby will be longer

D. women will be cleverer

74. Which factor is the most promising related to reproductive success?

A. Genetic B. Social C. Environmental D. Cultural

75. This passage may most likely be taken from .

A. a geography magazine

B. a medicine and technology research journal

C. a daily newspaper

D. an entertainment book

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