Dressed in dark glasses and old clothes.they had taken special precautions so that no one should recognize them．题目和参考答案——青夏教育精英家教网—

9．The weather is changeable here．Please take more clothes．
_________．（　　）

	A．	Well，it depends．		B．	It's a pleasure
	C．	OK，just in case．		D．	Take your time．

5．

Fuel Cell Technology for Cars
Fill her up with hydrogen？That's what someCalifornia motorists may be saying soon，as car makers tryto speed up production of zero emission（零排放） cars to meet state requirements in the near future．
Beneath the skin of this ordinary looking Hondas FCX Concept Vehicle sits an electro-chemical reactor：a hand built，astronomically expensive power plant known as a fuel cell．It's expected to be running ordinary family cars on California's roads within three years．
So what exactly is a fuel cell，anyway？Why are governments，private businesses and academic institutions cooperating to develop and produce them？A fuel cell，very simply described，is a power generator，making electricity through the combination of hydrogen and oxygen．Fuel cells generate electrical power quietly and efficiently，without pollution，Unlike power sources that use fossil fuels，the only by-products from an operating fuel cell are heat and water．To be more technical about it，a hydrogen atom with its one electron，attempts to pass through a fuel cell membrane（膜） to unite with an oxygen atom．The membrane allows only the hydrogen proton（质子） to pass through，forcing its electron to run around the membrane to catch up with the proton on the other side．This creates electricity，water，and heat，but no exhaust emissions．
If the fuel cell is powered with pure hydrogen，it has the potential to be up t0 80-percent efficient，That is，it turns 80percent of the energy content of the hydrogen into electrical energy．However，we still need to turn the electrical energy into mechanical work．This is accomplished by the electric motor．A reasonable number for the efficiency of the motor is about 80percent．So we have 80-percent efficiency in generating electricity，and 80-percent efficiency turning it into mechanical power．That gives an overall efficiency of about64percent．Honda's FCX concept vehicle reportedly has 60-percent energy efficiency，which is twice or even three times more efficient than usual cars．
But in spite of all the advantages described above，experts say，"We still have technical challenges getting this extremely complex system to work properly，the way customers expect it to work．There are challenges in using new fuels，and providing the new fuel basic facilities．And before fuel cell vehicles hit the road，there will have to be a network of hydrogen stations that will allow drivers to fill up with the flammable gas，under 36-hundred pounds of pressure．"

61．What can be inferred from California's"zero emissions policy"？C
A．New cars with fuel cell technology will surely become much cheaper．
B．By carrying out the policy，traffic will not be so busy as it is now．
C．The quality of life in California will improve once this policy is in effect．
D．With facilities of new kinds，more local employment will be created．
62．What does the phrase"power plant"refer to？A
A．A power device generating electricity．
B．A power station providing electricity．
C．A power component consuming electricity．
D．A power engine using electricity．
63．One of the reasons why fuel cell powered vehicles are superior is that．C
A．they give out almost no water or heat
B．they run faster and more smoothly
C．they give out almost no noise
D．they turn 64% of the energy into electricity
64．What does the author want to tell us in the last paragraph？D
A．Customers will not think it a good idea to develop fuel cell technology．
B．It is still not very easy to speed up production of zero emission cars．
C．We can't ignore the financial problems to build a network of hydrogen stations．
D．We still have much difficulty turning all the chains of the business into reality．

2．A．Why to turn to alternative energy
B．How to use renewable energy
C．The sources of renewable energy
D．What is renewable energy？
E．Where is the solar energy from？
F．The advantages of renewable energy
61．D
When speaking about renewable energy，we are talking about power which gets its energy，we are talking about power which gets its energy from resources which will not be diminished from the use．Renewable energy is a substitute for the nonrenewable energy of fossil fuel．
62．F
One fundamental advantage of renewable energy，and environmentalists'favorite reason to promote its use，is that there are no greenhouse gases or other pollutants that give out as there are with the burning of fossil fuels．Renewable energy，or solar，water and wind power，are certainly not new although they have received much attention recently because they will not cause pollution．Environmentally friendly power sources such as wind，solar and water power have been used in both developing and developed countries for a long time because they are cheap and clean，but they have yet to be used as a primary source of energy for any big urban area．
63．A
The generation of power from renewable energy sources has become somewhat more common in recent times as people have increasingly become aware of issues such as climate change due to fossil fuel by products and the political or social worries about nuclear power．There are numerous countries and non-profit，environmentally conscious organizations that are supporting the use of renewable energy．
64．C
The flow of renewable energy has to do with naturally occurring phenomena．Tides，sunlight，wind and heat are all created by geothermal events and all are sources of energy．Each of these sources of energy has unique characteristics related to where and how we can use them．
65．E
Most technology which transforms renewable energy into power which we can use is solar powered either directly or indirectly．The atmospheric system of the earth keeps balance so that the heat which spreads out into space is equal to the amount of radiation received from the sun．The quantity of energy contained in the atmosphere approximates the earth's climate．The bodies of water of the earth，or its hydrosphere，absorb much of the radiation which is received from the sun．And much of that absorbed radiation is in the lower latitudes surrounding the equator．

9．How many countries does the UK consist of？

10．He was given a gold watch as a rewardfor his contributions to the company．

17．Debbie intends to take short rests every two hours．She will have something to drink but she will not eat any solid food．

14．Don't go and ask for her idea about our plan．By no meanswill she not agreeto it for the trip．（agree）
不要去问她关于我们计划的想法．为了这次旅行她绝对会同意的．

15．-Do you think students'using mobile phones has any advantages？
- ．（　　）

	A．	Yes，just in case		B．	Well，it just depends
	C．	Nothing at all		D．	Yes，perfectly

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