题目内容
（请给出正确答案）
Air pollution, together with overpopulation, ______ many problems in big cities today.
A．are causing -
B．is causing
C．are caused
D．is caused
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更多“Air pollution, together with o…”相关的问题
Air pollution is the most serious kind of pollution because ______.
A．it's bad for all living things in the world
B．it makes much noise
C．it makes our rivers and lakes dirty
D．it makes us angry more easily
Because of the reduction of air pollution, this city now is a good place ______.
A．to live in
B．to be lived
C．where to live
D．which to live
A、traffic restrictions based on license plate numbers
B、the difficulty to park the car
C、air pollution
D、all of the above
根据以下内容回答题，
There was one thought that air pollution affected only the area immediately around large cities with factories and heavy automobile traffic．At present，we realize that although these are the．areas with the worst air pollution，the problem is literally 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 of manufacturing and automobile tmmc．In fact，the very climate of the entire earth may be infected by air poilu-tion．Some scientists consider that the increasing concentration of carbon dioxide in the air resulting from the burning of fossil fuels（coal and oil）is creating a“greenhouse effect”——con-serving heat refleeted from the earth and raising the world’S average temperature．If this view is correct and the worid’s temperature is raised only a few degrees，much of the polar ice cap will melt and cities such as New York，Boston，Miami，and New Orleans will be in water． Another view．1ess widely held，is that increasing particular matter in the atmosphere is blocking sunlight and lowering the earth’s temperature——a result that would be equally disas-trous．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 fanning areas．Today we do not know for sure that either of these conditions will happen（though one recent government report drafted bv experts in the field concluded that the greenhouse effect is#cry possible）．Perhaps，if we are lucky enough，the two tendencies will offset each other and the world’s temperature will stay about the same as it is now．
As Dointed out at the beginning of the passage，people used to think that air pollution__________ ．
A.caused widespread damage in the countryside
B.affected the entire eastern half of the United States
C.had a damaging effect on health
D.existed merely in urban and industries areas
阅读理解：阅读下面短文，选择合适的内容将短文补充完整。
A. to cook or heat your home
B. checked regularly
C. to reduce air pollution
D. Use less electricity
E. Raising any sort of livestock
Man-made air pollution mainly comes from two sourcesA、mobile ones and stationary ones. Mobile sources are cars, planes, boats, etc. Stationary sources include large factories, power plants and every household, which burns natural gas or wood. The most important ways _____ are to drive less, use less electricity and natural gas, and eat vegetarian.
_THESE IDEAS ARE EASY TO FOLLOW:_
1. Get your car _____ to make sure everything works properly. Whenever possible, walk, cycle, carpool, or use public transportation. Buy fuel-efficient vehicles. Drive at 60 mph or less to improve gas mileage.
2. Burn less natural gas _____ . Instead, use a solar cooker or heater and wear extra layers.
3. Become a vegetarian or a vegan. _____ requires more land and emits more carbon dioxide than simply growing crops directly for human food.
4. _____. Coal power plants produce most of the world’s electricity, and they also produce more carbon dioxide than any other source. Coal plants also release many other pollutants. Unplug televisions, cell phone chargers, and other appliances while not in use. Most devices continue to use small amounts of power even when they’re turned off. Avoid using air conditioning, and don’t leave the fridge open any longer than necessary. Only run the clothes washer or dish washer when full. Rather than using a dryer, hang clothes on a line to dry in the sun.
less popular airports was a much cheaper alternative to the major city airports and supported Airtite’s low cost service,
modelled on existing low cost competitors. These providers had effectively transformed air travel in Europe and, in so
doing, contributed to an unparalleled expansion in airline travel by both business and leisure passengers. Airtite used
one type of aircraft, tightly controlled staffing levels and costs, relied entirely on online bookings and achieved high
levels of capacity utilisation and punctuality. Its route network had grown each year and included new routes to some
of the 15 countries that had joined the EU in 2004. Airtite’s founder and Chief Executive, John Sykes, was an
aggressive businessman ever willing to challenge governments and competitors wherever they impeded his airline and
looking to generate positive publicity whenever possible.
John is now looking to develop a strategy which will secure Airtite’s growth and development over the next 10 years.
He can see a number of environmental trends emerging which could significantly affect the success or otherwise of
any developed strategy. 2006 had seen fuel costs continue to rise reflecting the continuing uncertainty over global
fuel supplies. Fuel costs currently account for 25% of Airtite’s operating costs. Conversely, the improving efficiency of
aircraft engines and the next generation of larger aircraft are increasing the operating efficiency of newer aircraft and
reducing harmful emissions. Concern with fuel also extends to pollution effects on global warming and climate
change. Co-ordinated global action on aircraft emissions cannot be ruled out, either in the form. of higher taxes on
pollution or limits on the growth in air travel. On the positive side European governments are anxious to continue to
support increased competition in air travel and to encourage low cost operators competing against the over-staffed
and loss-making national flag carriers.
The signals for future passenger demand are also confused. Much of the increased demand for low cost air travel to
date has come from increased leisure travel by families and retired people. However families are predicted to become
smaller and the population increasingly aged. In addition there are concerns over the ability of countries to support
the increasing number of one-parent families with limited incomes and an ageing population dependent on state
pensions. There is a distinct possibility of the retirement age being increased and governments demanding a higher
level of personal contribution towards an individual’s retirement pension. Such a change will have a significant impact
on an individual’s disposable income and with people working longer reduce the numbers able to enjoy leisure travel.
Finally, air travel will continue to reflect global economic activity and associated economic booms and slumps together
with global political instability in the shape of wars, terrorism and natural disasters.
John is uncertain as to how to take account of these conflicting trends in the development of Airtite’s 10-year strategy
and has asked for your advice.
Required:
(a) Using models where appropriate, provide John with an environmental analysis of the conditions affecting the
low cost air travel industry. (12 marks)
(46)
A．been
B．worked
C．stayed
D．lived
听力原文：W: Hi, Mike.
M: Hi. I'm surprised to see you on the city bus. Why not drive your car？
W: (23)I've been thinking about the environment lately. If we all use public transportation when we could, the air will be much cleaner.
M: Right. But the bus isn't exactly pollution free.
W: True. But they'll be running a lot cleaner soon, We were just talking about that in my environmental engineering class.
M: What's the city going to do？ Install pollution filters of some sort on their buses？
W: They could, but those filters make the engines work harder and really cut down on fuel efficiency. Instead they found a way to make their engines more efficient.
M: How？
W: Well, (24)there is a material called the coniine oxide. It's a really good insulator. And a thick coat of it gets sprayed on the certain part of the engine.
M: An insulator？
W: Yes. (25)It reflects back the heat of burning fuel. So the fuel will burn much hotter and burn up more completely.
M: So a lot less unburned fuel comes out to pollute the air, right？
W: Yeah, and the bus will need less fuel. So with the savings on fuel cost, they say this will all pay for itself in just six months.
M: Sounds like people should all go out and get this stuff to spray their car engines.
W: Well, not really that easy. To melt the materials before you can spray a coat of it on the engine parts, you first have to heat it over 10,000 degrees. It's not something we are able to do ourselves.
(20)
A．Something is wrong with her car.
B．The cost of the fuel is high.
C．It's cheap to take bus.
D．She thinks public transportation is environmental friendly.
