basic needs for water-whether for drinking, agriculture, industry or the raising of fish will always have to
be met. Given that premise (前提) , there are two basic routes we can go:more equal access to water or
better engineering solutions.
Looking at the engineering solution first, a lot of my research concentrates on what happens to
wetlands when you build dams in river basins, particularly in Africa. The ecology of such areas is almost
entirely driven by the seasonal changes of the river-the pulse of the water. And the fact is that if you build
a dam, you generally spoil the downstream ecology. In the past, such problems have been hidden by a
lack of information. But in the near future, governments will have no excuse for their ignorance.
The engineers" ability to control water flows has created new kinds of unpredictability too. Dams in
Africa have meant fewer fish, less grazing and less flood- plain (洪泛区) agriculture-none of which were
expected. And their average economic life is assumed to be thirty years. Dams don"t exist forever, but
what will replace them is not clear.
The challenge for the future is to find new means of controlling water. Although GM technology
(转基因) will allow us to breed better dry land crops, there is no market for companies to develop
crops suitable for the micro-climates of the Sahel and elsewhere in Africa. Who is going to pay for
research on locally appropriate crops in the Third World?
B. The engineering solutions to water resource and their limitation.
C. The basic means of controlling water.
D. The challenge for developing crops.
B. More dams should be built in river basins.
C. More wetlands should be protected from destruction.
D. More dry-land crops could be developed in Africa.
3. The author suggests that governments will have no excuse for their careless ignorance in the future
because .
B. the ecological destruction will no longer be a problem in the future
C. the future is an information age
D. governments will face greater challenge in the future
B. less grazing land
C. less farming land
D. less floodplain agriculture
B. researchers have no interest in developing dry land crops
C. research on locally appropriate crops in the Third World may be profitable
D. There is less water resource in the Third World
resources of the sea were unlimited. For example, a noted biologist writing in the mid-19th century
commented that none of the great sea fisheries(渔业) are to be exhausted. Today though, there is
evidence that the resources land and the air, and that the endangered species (种类) include Herring
and Carp as well as the African Elephant, Indian Tiger, and the American Eagle.
Further, the threats to fish are more alarming in some ways than the threats to animals and birds.
This is because fish are a much needed food resource and people throughout the world depend on
fish as an important part of their dish, and the decline (下降) in the fish supply could have extensive
effects on hunger and population.
Fishermen in the North Atlantic alone annually harvest 20 billion pounds of fish to satisfy food
demands, but it is important to recognize that these practices cannot continue without depleting (耗尽)
fish storage within the next few years. Sea resources are rapidly declining in many parts of the world,
and the problem cannot he ignored (忽视) .
We can predict that food supplies in the sea can not last forever.
the sea?
B. Depleted.
C. Limited.
D. Unlimited.
B. The whole world.
C. Asia and America.
D. America.
B. None of the great sea fisheries are to be exhausted.
C. Fish supply has no effects on people.
D. Sea resources are important to people.
B. Threats to Animals and Birds
C. Sea Resources on the Decline
D. Protection of Fish
there for about a year, and then will be replaced with another group of pioneers. Building
the base on Mars will advance our knowledge of the solar system and aid in our
understanding of the earth.
We already know that Mars resembles the earth in many aspects : general size,
presence of water, lengthof day, range of temperatures. These resemblances have
caused many people to consider a centuries-long project: to transform Mars.
Transforming means alterinB a planet"s surface so that the Earth"s life forms can
survive there. This concept, previously found only in science fiction is now being
seriously considered by scientists.
Transforming Mars is theoretically simple : add nitrogen (氮气)and oxygen to the
atmosphere; pump water to the surface; and add the earth"s plants and animals in the
order in which they developed on the Earth. But it will take at least 300 years.
Some people think that such a project is too huge for humans to undertake, but
there are very good reasons to make the attempt. The earth now contains some 6
billion people and no one has any idea of how many humans the earth can support.
Our very existence and numbers are threatening many other species. We also have
had some experience with transforming our own planet : altering thelandscape ,
theatmosphereand the climate. Currently transforming earth has become a wiser activity
as we try to control global warming, air and water pollution, and" preserve some natural
living places.
While the possibility of such a project is small, it is not impossible. Even if earthbound
societies come and go in the next 300 years, the project can continue through the work
of the Mars settlers without the need for constant backing from the earth.
The future existence of all the people in our world may very well depend upon our ability
to transform Mars.
B. Changing.
C. Planting.
D. Building.
B. find out its similarity to the Earth
C. avoid the dying way of many other species
D. find on Mars living place for the increasing human beings
B. transforming Mars is theoretically simple
C. our existence and numbers are threatening many other species
D. the development of science and technology is very rapid
B. Negative.
C. Sceptical(怀疑的 ) .
D. Objective.
Most scientists agreed that cloning an entire human being-besides morally
questionable-was filled with technical problems. After all, research into animal cloning
has already shown that there are hundreds of failures, includingmanybadlydeformed
(畸形的)creatures that were usually miscarried.
Now comes word that it might be easier to clone humans than was previously
believed. People have a genetic quirk(怪癖) that might prevent some of the
developmental deformities associated with animal cloning. One gene, called IGF2R,
is normally imprinted in sheep, cows and mice but not in humans. Human clones would
always inherit non-imprinted IGF2R genes, so there would be no chance of a mix-up
and, their growth would be normal. But what of the other 49 0r so imprinted genes
(遗传基因 ) ?No one knows what troublethey might cause. So the fact humans have
one less imprinted gene than mice, sheep or cows means that human
cloningmightbemarginally (轻微地 ,很少地 ) easier , but not necessarily safer.
B. it faces no moral problems now
C. it might be easier but still not safer
D. it is proved by practice that it is easier, only not so safe
B. A genetic quirk.
C. A non-imprinted IGF2R.
D. Not clearly found.
B. 50.
C. 49.
D. 48.
B. it should be properly controlled
C. it should be stopped
D. it should be forbidden by law
within just three centuries, according to some scientists.
These scientists found that rising temperatures in some places mean humans would
be unable to adapt or survive. "" It would begin to occur with global - mean warming
of about 7℃, calling the habitability of some regions into question," the researchers
wrote in a paper.
With 11-12℃ warming, such regions would spread to include the majority of the
human population as currently distributed. Professor Steven said there was no chance
of the earth heating up by 7℃ this century, but there was a serious risk that the
continued burning of gas and coal could create the problem by 2300. ""There"s
something like a 50/50 chance of that over the long term," he said.
The study, which examined climate change over a longer period than most other
research, looked at the "heat stress" produced by combining the influence of rising
temperatures and increased humidity (湿度).
Professor Steven said climate change research had been "short-sighted" not to
realize the long-term consequences of the influence of greenhouse gases blamed for
global warming. "It needs to be paid attention to," he said. "There"s not much we can
do about climate change over the next two decades but there"s still a lot we can do
about the longer term changes." "Near 2300, we may be faced with temperature
increases of 12 degrees or even more," Professor Tony Michael said." If this happens,
our current worries about sea level rise, occasional heat waves and bushfires,
biodiversity (生物品种) loss and agricultural difficulties will appear in front of us -- as
much as half the currently inhabited globe may simply become too hot for people to
live there. "
B. Burning of fuel adds to the earth"s heating.
C. We may be faced with temperature increases of 12 degrees.
D. Climate change would not stop until 2100.
B. doesn"t think we can do anything to avoid global warming
C. believes we can do much to prevent the longer term changes
D. wishes to examine climate change over a longer period
B. large parts of the earth may be too hot for humans to live on by 2300
C. greenhouse gases are to blame for global warming
D. human beings will die out three centuries later
(导向设备) built for the active business traveler.
The three C"s of value for Internet-connected GPS:
●Confidence: Get to meetings on-time and stress-free with real-time traffic alerts.
Find what you need from Internet- connected search.
●Convenience :Plan your trips online before you head out of the door. Access the
latest maps automatically.
●Current: Get new features as we continuously innovate (创新). Save money on
gas with fuel prices that are updated regularly.
Many features are specially designed to help the active business traveler.
●While driving, TeleNav Shotgun checks for traffic updates along your route every
five minutes. If there"s trouble ahead, TeleNav Shotgun will let you know with a friendly
voice and a visual sign. With one tap, you can choose to change course, taking into
account the latest traffic conditions in the area.
● In your world, it"s often one busy day after another. The last thing you need is the
trouble of writing down addresses so you can put them into your navigation system later.
When life is very busy, TeleNav Shotgun helps keep you organized. With our online
pre-planning feature, you can easily forward addresses to your TeleNav Shotgun from
the convenience of your home or office computer.
●We have built one of the largest up-to-date databases of business listings available
online and on a personal navigation device. Look up more than 11 million points of
interest.
Some features that we are currently working on:
●Address Share -- Share addresses or your location to meet up with friends more
efficiently.
●Weather -- Get up -to -date, detailed weather information.
●Commute (通勤) Alerts -- Get emailed alerts about traffic conditions on your
daily commute.
Price of TeleNav Connected Service
TeleNav Connected Service Plan Price
Month - to - Month payment $12
1-Year Plan $129
2-Year Plan$239
"If I was to get a stand alone, it would be the Shotgun." -- JG Mason, Gadgetell
"I"m connected with TeleNav Shotgun and my whole world is easier to navigate."
-- Dory Delvin
B. help reserve tickets and rooms in a hotel
C. offer the route with the least traffic delays
D. show the scenery of the place
B. Making your busy days easier to manage.
C. Finding what you need with ease.
D. Helping improve your work performance.
B. It saves money for the users.
C. It can access the latest maps automatically.
D. It has real -time traffic alerts.
you can save ______.
B. $49
C. $129
D. $239
- 1漫画的寓意启示我们,思想道德建设必须[ ]A.重视家庭美德建设 B.加强社会公德建设C.营造良好的生活环境 D.
- 2The National Geographic Channel has unearthed a time capsule
- 3目前预防甲型H1N1流感的疫苗已研制成功,通过志愿者进行接种实验,各项指标正常。试分析,志愿者所接种疫苗和体内发生的免疫
- 4下列各句中,划线的词语运用正确的一项是( ▲ )A.网易今天公布的审计财报显示,2011年第四季度网易净利润为8.99亿
- 5运用你课外阅读积累的知识,完成小题。 (4分)小题1:罗曼•罗兰的《名人传》是为德国音乐家贝多芬,意大利雕刻家、画家
- 6一块正方形钢板上截去3cm宽的长方形钢条,剩下的面积是54cm2,则原来这块钢板的面积是( )cm2。
- 7将一小球从距地面h高处,以初速度v0水平抛出,小球落地时速度为v,它的竖直分量为vy.则下列各式中计算小球在空中飞行时间
- 8下列句子中加点词语的意义和用法相同的一组是( )A.以其无礼于晋,且贰于楚也燕王诚振怖大王之威,不敢兴兵以拒大王B.尽吾
- 9下列关于声音的说法中不正确的是( )A.用超声波清洗钟表,说明声具有能量B.“隔墙有耳”说明固体也能传声C.“闻其声
- 10如图所示,小纸条靠近水龙头流下的稳定的水流,关于小纸条的运动情况,以下分析正确的是: [ ]A.小纸条靠近水流,
- 1下列现象中不是生物对外界刺激作出反应的是( )A.惊弓之鸟B.蜻蜓点水C.杯弓蛇影D.望梅止渴
- 2已知数列,把数列的各项排成如图所示的三角形数阵.记为该数阵的第行中从左往右的第个数,则_______.
- 3【综合运用】试补充下面人物的语言。(1)第二次世界大战期间,德寇法西斯头子之一的戈林,曾问一名瑞士军官:“你们有多少人可
- 4实验室常用下列装置制取气体,请你根据所学知识回答下列问题.(1)写出编号所指仪器的名称:①______;②______.
- 5三种正盐的混合溶液中含有0.2 mol Na+、0.25 mol Mg2+、0.4 mol Cl-,则SO为A.0.1
- 6有关雨林开发和保护的争论你有什么看法?有没有消除分歧的办法? _____________________________
- 7工厂车间的流水线,常用传送带传送产品,如图所示,水平的传送带以速度v=6m/s顺时针运转,两传动轮M、N之间的距离为L=
- 8集合,则= .
- 9课堂上,教室里各个位置的同学都能看到黑板上的字,这是因为光在黑板上发生 (选填“漫”或“镜面”)反射的缘故;个别
- 10__________ can you expect success.A.By working hardB.Working