people on the earth, and natural resources seemed to be unlimited.
Today things are different. The world has become too crowded. We are using up our natural
resources too quickly, and at the same time we are polluting our environment with dangerous chemicals.
If we continue to do this, human life on the earth will not survive.
Everyone realizes today that if too many fish are taken from the sea, there will soon be none left. Yet,
with modern fishing methods, more and more fish are caught. We know that if too many trees are cut
down, forests will disappear and nothing will grow on land. Yet, we continue to use more powerful
machines to cut down more and more trees.
We realize that if rivers are polluted with waste products from factories, we will die. However, in
most countries waste is still put into rivers, but there are few laws to stop this.
We also know that if the population of the countries in the world is to rise at the present rate in a few
years, there will not be enough food.
What can we do to solve these problems?
If we eat more vegetables and less meat, there will be more food available for everyone. Land that is
used to grow crops can feed five times more people than land where animals are kept.
Our natural resources will last longer if we learn to recycle them.
The world population will not rise so quickly if people use modern methods of birth control.
Finally, if all of us think about the problem, we will have a better and cleaner planet in the future.
B. the unlimited natural resources in the world
C. our rivers are being polluted by waste from factories
D. the ways early man protected the environment
B. In the past, there was no need for people to think about environmental protection.
C. If we keep on cutting trees, forests will disappear.
D. We shouldn’t take more and more fish out of the sea, or there will soon be no fish left.
B. Man will destroy himself if he doesn’t solve the problem.
C. Modern fishing methods are helpful in our fishing industry.
D. We should make more laws in order to survive.
B. are being polluted
C. are as plentiful as in the past
D. are being used up very quickly
factories and heavy automobile traffic. At present, we realize that although these are the areas with the
worst air pollution, the problem is worldwide. On several occasions over the past decade, a heavy cloud
of air pollution has covered the east of the United States and brought health warnings in rural areas away
from any major concentration (集中)of manufacturing and automobile traffic. In fact, the very climate of
the entire earth may be infected by air pollution.
Some scientists consider that the increasing concentration of carbon dioxide in the air resulting from
the burning of coal and oil is creating a "greenhouse effect" - raising the world"s average temperature. If
this view is correct and the world"s temperature is raised only a few degrees, much of the polar ice will
melt and cities such as Newk York, Boston, Miami, and Newk^ Orleans will be in water.
Another view, less widely held, is that increasing particular matter in the atmosphere is preventing
sunlight and lowering the earth"s temperature - a result that would be equally disastrous. A drop of just
a few degrees could create something close to a new ice age, and would make agriculture
difficult or impossible in many of our top farming areas. Today we do not know for sure that either of
these conditions will happen though one recent government reports that the greenhouse effect is very
possible. Perhaps, if we are lucky enough, the two tendencies will offset(抵消)each other and the world"s
temperature will stay about the same as it is now. Driven by economic profits, people don"t think about
the damage on our environment caused by the "advanced civili
zation". Maybe the air pollution is the price the human beings have to pay for their develo
pment. But is it really worth?B. affected the entire eastern half of the United States
C. had damaged effect on health
D. existed only in urban and industrial areas
B. is uncertain of its happening
C. rejects it as being ungrounded
D. thinks it will destroy the world soon
B. raising the world"s temperature only a few degrees would not do much harm to life on earth
C. almost no temperature variations have occurred over the past decade
D. the world"s temperature will remain constant in the years to come
B. the burning of
coal and oilC. the potential effect of air pollution
D. the likelihood of a newk ice age
信息匹配。
根据短文内容,从短文后的选项中选出能填入空白处的最佳选项.选项中有两项为多余选项。
Many solutions we seek with regard to achieving sustainability(可持续性) are within our reach.
That"s the lesson our school"s Environment Club has learned over the past two years. We"ve reduced
the amount of our waste at our school by 25 per cent. 1 We have the evidence we need to
suggest we are making a difference. If you are interested in leading your school on a similar journey
of change, here are some tips.
2
Examine the garbage can to find out how much of your school"s garbage could be picked out from
the waste stream and be reused. We found that more than 80 percent of our waste could have been
reused, recycled or composted(制成堆肥).
Prepare dustbins there.
3 You will find you can cover the cost of the purchase of the dustbins within a few months simply
by selling the bottles and other items you collect.
Compost the waste.
Start a composting system in your school. You may reduce your waste by as much as 50 percent.
Be sure to talk with your teachers and your cafeteria staff to get them onside.
Share your success.
Let your community know what you"ve accomplished. 4 Ask your teachers if you can talk to
their classes, let your parent group know what you"re doing, and present a report to the president of
your school.
5
Whether you spend a few moments in a quiet place or the whole day walking along a beautiful beach,
time outdoors will remind you why the work you do for the environment is so worthwhile.
A. Dig in.
B. Reward yourself.
C. Do outdoor activities.
D. They"ll feel proud of you.
E. We need to go further, and we will.
F. Invite your friends to join your cause.
G. Make sure every classroom has dustbins for recycling.
means it"s time to take care of yourself.
Students, take note. When you arrive at university, make sure you register with a doctor near your
term-time address. If there is a university doctor at your institution, they will be your best choice. If not,
ask student services for a recommendation. Once registered, do everything you can to make sure you
never have to pay them a visit. Don"t take unnecessary health risks.
Cook meat thoroughly. Throw food away if it"s out of date. Clean up after yourself. Food poisoning
can be harmful, but it"s easy to avoid if you pay due care and attention.
University often brings a certain lifestyle, and while that"s usually a whole lot of fun, it can quickly tip
into a whole lot of sorrow. Know your limits when it comes to alcohol. Habitual drinking can be
dangerous, and while every student will have nights of excess, these should be the exception, not the
norm. Look out for your friends, too. If you"re worried about alcohol or substance abuse, visit
alcoholics-anonymous.org.uk <http://alcoholics-anonymous.org.uk> or ukna.org http://ukna.org
for free and confidential support.
Anyone living with teenagers and young adults, especially in environments such as halls of residence,
must accept that germs (细菌) will be shared. Bugs and colds will spread like wildfire. Living
communally brings certain health risks, and meningitis is probably the most serious of these. Symptoms
include a rash, stiff neck and an aversion to bright lights. It"s rare, but seek immediate medical attention
if you"re concerned (meningitis.org <http://meningitis.org>).
Gappers, meanwhile, may need to consider specific health risks. If you"re planning a trip abroad,
especially in rural areas of poor countries, make sure you get the necessary vaccinations (预防注射) in
good time before you leave.
Research these at www.netdoctor.co.uk <http://www.netdoctor.co.uk>. You should be able to get everything you need from your doctor, although you may have to give them notice and you may have to pay, even on the NHS (英国国家医疗服务体系). If you also need to take medication while you"re away, such as anti-malarials, do it faithfully.
On a general note, whoever you are, wherever you are and whatever you do with your time, never walk alone at night, especially in quiet and badly lit areas. Always carry your phone. Never get in an unlicensed cab. Be careful who you trust. Respect your new independence, and keep yourself safe.
B. who live outside the campus
C. who are going to university
D. who want to keep fit at university
B. a serious infectious illness
C. anti-malaria medicine
D. wide-spread germs and bugs
B. ukna.org <http://ukna.org>
C. alcoholics-anonymous.org.uk http://alcoholics-anonymous.org.uk
D. meningitis.org <http://meningitis.org>
B. Students have to register with a doctor for free medical care.
C. Students prefer to live in environments such as halls of residence.
D. Students have to avoid health and security risks to be independent.
We produ
ce 500 billion of plastic bags in a year world-wide and they are thrown
away polluting oceans, killing wild-life and getting dumped in landfills where they take
up to 1,000 years to decompose. Researchers have been unsuccessfully looking for a
solution.
The 16-year-old Canadian high school student, Daniel Burd, from
Waterloo Collegiate
Institute, has discovered a-way to make plastic bags degrade(降解)in as few as 3months,
a finding that won him first prize at the Canada-Wide Science Fair, a $10,000 prize, a
$20,000 scholarship, and a chance to revolutionize a major environmental issue.
Burd"s strategy was simple: Since plastic does eventually degrade, it must be eaten by
microorganisms(微生物). If those microorganisms could be identified, we could put them
to work eating the plastic much faster than under normal conditions.
With this goal in mind, he ground plastic bags into a powder and concocted(调制)a
solution of household chemicals, yeast(酵母)and tap water to encourage microbes growth.
Then he added the plastic powder and let the microbes work their magic for 3 months. Finally,
he tested the resulting bacterial culture on plastic bags, exposing one plastic sample to dead
bacteria as a control. Sure enough, the plastic exposed(暴露)to the live bacteria was 17%
lighter than the control after six weeks.
The inputs are cheap: maintaining the required temperature takes little energy because microbes
produce heat as they work, and the only outputs are water and tiny levels of carbon dioxide.
"Almost every week I have to do chores and when I op
en the closet door, I have piles of plastic
bags falling on top of me. One day, I got tired of it and I wanted to know what other people are
doing with these plastic bags. The answer: not much. So I decided to do something myself." said
Daniel Burd.
B．he contributed much to environmental protection
C．he found a way to degrade plastics in shorter time
D．he could encourage microbes growth in an easier way
B．test how effective his method was
C．know which bacteria worked faster
D．control the temperature in the process
B．microbes can produce heat themselves
C．much carbon dioxide is produced
D．the temperature can be controlled
B．the failure of researchers
C．his everyday work
D．the practice of other people
say.
According to the Centers for Disease Control and Prevention,more than 126 million Americans
who don"t smoke are exposed to secondhand smoke in their homes,vehicles,workplaces,and public
places. This exposure causes thousands of lung cancer and heart disease deaths among nonsmokers
every year,according to the California Environmental Protection Agency.
"Making the leap from the effects of secondhand smoke on humans to their effects on pets isn"t a
big one," says veterinarian (兽医专家) Carolynn MacAllister of Oklahoma State University.
"There have been a number of scientific papers recently that have reported the significant health
threat secondhand smoke poses to pets," MacAllister said. "Secondhand smoke has been associated
with oral cancer and lymphoma in cats,lung and nasal cancer in dogs,as well as lung cancer in birds."
Studies have also shown that dogs living in a smoking household are susceptible to cancers of the
nose and sinus area,particularly if they are a long-nosed breed,because their noses have a greater
surface area that is exposed to carcinogens and a greater area for them to accumulate. Dogs affected
with nasal cancer normally don"t survive for more than one year.
"Short and medium-nosed dogs are more susceptible to lung cancer,because their shorter nasal
passage aren"t as effective at accumulating the inhaled secondhand smoke carcinogens," MacAllister
said. "This results in more carcinogens (致癌物质) reaching the lungs."
Birds are also at risk for lung cancer,as well as pneumonia,because their respiratory systems are
hypersensitive to any type of air pollutant.
To help prevent animals from being adversely affected by smoking,pet owners who smoke should
have a designated smoking area that is separated from the home or stop smoking altogether,MacAllister
said.
B. non-smokers
C. pets
D. trees
B. Smokers can smoke at any time.
C. Smokers should smoke in the designated place.
D. Smokers must give up smoking at once.
B. Short-nosed dogs
C. Medium-nosed dogs
D. Dogs without noses
B. Secondhand Smoke Causes Cancer in Birds
C. Secondhand Smoke Causes Cancer in Pets
D. Secondhand Smoke Causes Cancer in Cats
B. are hard to be influenced by
C. are less to be effected by
D. are lucky to be caught by
- 1已知F1、F2为双曲线C：x2-y2=1的左、右焦点，点P在C上，∠F1PF2=60°，则P到x轴的距离为 [
- 2自然界中的动物和植物在长期生存与发展的过程中，形成了相互适应、相互依存的关系．______．
- 3设a，b，c都是实数． 已知命题若，则；命题若，则．则下列命题中为真命题的是
- 4我国最大的油田是[ ]A．大庆B．胜利C．华北D．中原
- 5下列物质既能与盐酸作用，又能与澄清石灰水作用的是（ ）A．NaOHB．NaNO3C．Na2SO4D．NaHCO3
- 6有A、B、C、D四种物质的溶液，它们是HCl、Na2SO4、Na2CO3、Ba（OH）2中的一种．它们有如下转化关系：①
- 7 景春曰①：“公孙衍、张仪岂不诚大丈夫哉②？一怒而诸侯惧，安居而天下熄。”孟子曰：“是焉得为大丈夫乎？子未学礼乎？丈夫
- 8在国庆阅兵式上，我国海军陆战方队驾驶着水陆两用坦克通过天安门城楼时引起了小明的浓厚兴趣。他查阅到某水陆两用坦克的部分数据
- 9－Is Mary in the library, Tom?－No. She ______ with her friend
- 10—The train is leaving right now, but David hasn"t arrived ye
- 1右图是计算使成立的最小自然数的程序框图，判断框应填的内容是_________？处理框应填的内容是输出_________.
- 2已知：①CH3OH（g）+H2O（g）=CO2（g）+3H2（g），△H=+49.0kJ•mol-1②CH3OH（g）+
- 3开封位于35°N附近，属于（ ）A．低纬度B．极点C．中纬度D．高纬度
- 4某物体是由若干个小立方体堆成的几何图形，其俯视图如下，正方形上标的数字为在此方位上小正方体的个数，试画出其左视图和主视图
- 5与豆科植物的生长密切相关的细菌是（ ）A．酵母菌B．醋酸菌C．乳酸菌D．根瘤菌
- 6为了对某课题进行研究，用分层抽样方法从三所高校A，B，C的相关人员中抽取若干人组成研究小组，有关数据见下表（单位：人），
- 7下面图片说明的是[ ]A．苏联是一个农业大国B．苏俄正在实施新经济政策C．苏联农业集体化的实施D．苏联社会主义工
- 8根据城镇居民家庭收入抽样调查结果，我国前几年在人均的全部收入中，劳动收入占73.8%（其中公有制企事业单位人员的工资收入
- 9All children want to have pocket money. Why do their parents
- 10新文化运动是一场资产阶级新文化反对封建主义的斗争。