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
(海啸). Along with four Haitian colleagues, Dr Hermann Fritz, a professor, travelled
around the coast of Haiti. He wanted to find out what had happened before the
evidence disappeared forever. He had heard reports and saw evidence that a wave
up to 3-meter high had hit some areas of the coast south of the capital following the
quake near Port au Prince. It had killed at least three people and engulfed (吞没)
buildings.
Dr Fritz presented some of his findings at the Ocean Sciences meeting in Portland
in the US. "This was a relatively small event," he told BBC News." Most of the deaths
were due to the earthquake, but at least three victims we know survived the earthquake
and were hit by the wave."
These three victims were a father and his two young sons. They were standing
close to the shore in Petit Paradis, watching the wave instead of heading for higher
ground. Draw-back in the water level is a sign that a big wave is coming. "It clearly
showed a lack of tsunami education," Dr Fritz said. "It was pure luck that the wrong
information did not kill more people in this case."
Despite the great damage it caused, the Haiti earthquake was not of the type
or magnitude (级) usually associated with tsunamis. It had a magnitude of 7.0.
"Generally anything over 7.5 is cause for concern," explained Eddie Bernard, a
tsunami researcher." But anything between 7 and 7.5 can cause smaller, local tsunamis."
It also occurred on land and, to cause a tsunami, it must happen under the sea.
"Anything that moves water generates a wave," said Dr Bernard. "And the deeper
the event, the bigger the wave." Dr Fritz explained that the main causes of the Haitian
tsunami were "local landslides". ""But there are fault lines in this region that are in areas
which are more likely to cause a tsunami and, if you have a much bigger landslide, you
could have a much bigger wave," he said.
B. check the damage to the coasts
C. gather evidence about the wave
D. study the power of the wave
B. they cared little about the direction of the big wave
C. they didn"t see the signs of big waves
D. they didn"t know it was time to run for higher ground
B. it was lucky that the loss wasn"t greater
C. earthquakes of the magnitude of 7.0 are common in Haiti
D. few Haitians know about tsunamis and earthquakes
B. Business.
C. Sports.
D. Entertainment.
On April twenty-second, some American children stayed out of school but they were
not punished. They were with their parents. As Faith Lapidus tells us, it was Take Our
Daughters and Sons to Work Day.
The Ms. Foundation for Women started the program seventeen years ago, in 1993.
At first it was just called Take Our Daughters to Work. Gloria Steinem and other
foundation leaders pointed to studies showing that self-image suffers as girls become
teenagers. They can lose trust in their abilities and intelligence, especially in areas like
science, math and technology. So the Ms. Foundation planned a day for parents in
New York City to show girls all the possibilities for them in the professional world.
But there was so much interest, the organizers decided to make it national.
At first, girls mostly followed their mom or dad around at work to learn about their
jobs. Later, employers and schools began to offer organized activities. But from the
beginning there were protests (反对) from parents and others about the exception of
boys. So in 2003 the day was renamed Take Our Daughters and Sons to Work.
2007 was the last year that the Ms. Foundation for Women headed the program.
Now, the event is run by a twelve-person group called the Take Our Daughters and
Sons to Work Foundation.
Carolyn McKecuen is president of the foundation. She says a total of about
thirty-three million children and adults are involved in the program. About one-third
of the adults work at large companies or nonprofit organizations. Another third are
in small businesses. The rest work in education.
Carolyn McKeeuen says the numbers from this year"s event are not final yet. But
early reports suggest that participation was up at least ten percent from last year. And
she says the foundation is hoping to find support to expand the program internationally.
She says there are lots of requests from other countries for information about how to
set up similar programs.
B. gifts are considered to be more foolish than boys
C. girls aren"t confident in some areas as they becomes older
D. girls don"t want to learn some science subjects
B. Because some parents wouldn"t like to take their daughters to work.
C. Because some employers were against parents" taking their children to work.
D. Because some schools didn"t want to give any students" time to leave school.
B. 18.
C. 14.
D. 10.
B. the Take Our Daughters and Sons to Work Day is a national in America
C. Mattel is the president of the foundation whose company makes Barbie dolls
D. lots of other countries want to set up similar programs for parents and children
- 1We have _________ meat at home, do we? [ ]A. little
- 2综观古代都城演变,宋都东京与唐都长安相比,在城市格局上发生了很大的变化,这种变化客观上反映了①市民文化的逐渐兴起②城市商
- 3下列变异中,不属于染色体结构变异的是[ ]A.染色体缺失某一片段B.染色体中DNA的一个碱基发生了改变C.染色体
- 4下列有关物质的分类错误的是( )A.生石灰属于氧化物B.小苏打属于盐C.干冰属于混合物D.酒精属于有机物
- 5如图所示的不等式的解集为( )A.x>-1B.x≥-1C.x<-1D.x≤-1
- 62005年11月11日,北京2008年奥运会吉祥物正式揭开面纱,五个可爱的“福娃”成为奥运会吉祥物。“福娃”的色彩与灵感
- 7光滑绝缘半球槽的半径为R,处在水平向右的匀强电场中,一质量为m的带电小球从槽的右端A处(与球心等高)无初速沿轨道滑下,滑
- 8要使一只“6V 3W”的灯泡接在24V的电源上正常发光,则应[ ]A.串联一只12Ω的电阻 B.串联一只“18V
- 9已知一次函数y=(m-3)x+2的函数值随着x的增大而减小,且一次函数y=(2m+3)x-3的函数值随着x的增大而增大,
- 10解方程:(1)5(x﹣1)﹣2(x+1)=3(x﹣1)+x+1;(2).
- 1青藏高原的气候特点[ ]A.终年寒冷B.冬季寒冷,夏季凉爽,降水很少C.降水丰富D.空气稀薄、日照充足、全年高温
- 2设,其中表示a,b,c三个数中的最小值,则的最大值为( )A.6B.7C.8D. 9
- 3如果让你扮演华佗,你应该具备的医学特长或成就是 ①针灸 ②外科手术 ③创制“麻沸散” ④编制“五禽戏” [ ]
- 4清末状元张謇认为:“救国为目前之急,……譬之树然,教育犹花,海陆军犹果也,而其根本则在实业。”在此,张謇认为解决“目前之
- 5(1)常温时向水中加入少量固体MgCl2,水的电离被______(填“促进”或“抑制”);与纯水相比,所得溶液中Kw__
- 6一对双眼皮夫妇,生了一个单眼皮子女,他们的第二胎是单眼皮的可能性为 [ ]A.0% B.25% C.100%
- 7短文填空。(每空2分,共16分) Once an American was 小题1: France. He could
- 8When it comes to a foreign language, he is not ________ quic
- 9下列多组词语中,没有错别字的一组是( )A.寒暄凋敝一筹莫展针贬时弊B.舟楫戕害真知灼见出类拔萃C.纰缪撕打矫揉造
- 10图为过M点(128°E,48°N)沿经线和纬线作相同长度的地形剖面示意图,读图回答问题。小题1:若为同一山脉,则该山脉的