In this task, you're given an article and an answer. Your task is to generate the question for the answer based on the given article.

Q: Article: Treat with Respect The speed with which Man is changing the face of Earth has outstripped all the mighty processes of nature put together. In his haste to supply himself with increasing quantities of Earth's treasures he risks destroying one he greatly needs, his natural surroundings. Some countries set aside unspoiled areas of natural beauty. prefix = st1 /Canadahas the largest system of national parks in the world, 29 in all covering about 13 million hectares, preserving the different landscapes and the plant and animal life. Other countries are restoring areas which have been reduced to waste land by mining. At Broken Hill in Australiadrifting sand from rock crushing turned the area into a desert swept by sand storms. This is now being irrigated, fertilized and planted with grass and trees. In Great Britain quarries and gravel pits are being filled in or made into lakes, industrial wasteland is being turned into playing fields and waste tips into sloping green hills. However Man tries to look after Earth, the fact is that he is using up at a great rate resources, especially fuel resources, which have taken millions of years to accumulate and which he cannot renew. Yet every day the Earth receives a huge supply of energy from the Sun. Man has made several experiments in using solar energy to heat furnaces , cookers, and water-distillers. In space technology, e.g. on satellites, solar cells convert sunlight into electricity. Houses and offices have been designed which are centrally heated by water or air heated by the sunlight. When Man can trap and store this energy, so that he can use it exactly as he needs it, he will have not only an endless supply, but a clean and safe one.
Answer: Energy from the Sun.

A: According to this selected passage, which energy is considered to be endless, clean and safe?
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Q: Article: TheUnitedStateshasaround475,000schoolbuses.Eachdaytheycarrymorethan25million children,halfofalltheschoolchildreninthecountry. Thesebuses,onaverage,use4litersofdiesel fueltotravellessthan16kilometers. When theschoolyearbeganlastfall,dieselaveraged55centsaliternationally.Thepricenearlydoubledby theendofschool inJune. BobRileyisthespokesmanfortheAmericanSchoolBusCouncil.Hesaysfuelpricesnegotiated for schools arenot lower thanothers have to pay. Asaresult,schoolsarelookingfor waystoreducetransportationcosts.Busroutesarebeing redrawnor,insomecases,canceled.Someareas arebuyingbusesthatuse naturalgas orother alternativefuels. Otherstepsincludefewerfieldtrips andlesstravel bysports teams.Someschool districtsmayend any busservicenotrequiredby law. Studiesshowthatschoolbusesarethesafestform oftransportationtoandfrom school. The AmericanSchoolBus Councilsayscutsinbus serviceare badfor childrenandpossiblythe environment.Itsaysremovingbusesfromtheroadwillmeananincreaseinothervehiclestransporting students. Spokesman Bob Riley saysanotherconcern is thatreducing busservicemightreduce attendance. It couldalso getmorechildren to walkor bicycle to school.That wouldsurely makepeople happy attheNationalCenterforSafeRoutestoSchool.Morekidswalkingorbikingsafelytoschoolisthe aimofa3-year-oldfederal program,partofaninternationalmovement.Thegoalis toincreasephysical activity and reduce air pollution.
Answer: Trafficjams willbereducedduringrushhour.

A: Whatistheadvantage ofreducingschoolbusserviceaccordingto thepassage?
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Q: Article: Though "nanometer" is now a fashionable term all over the world,few people know exactly what it is.It has become a new favorite of manufacturers and sellers in recent years.Many "high-tech" products bearing the name "nano" have entered the market,bringing more mysterious feeling to surprised consumers. Nanometer is a very small length unit of measure,and is very small.One millimeter is 1000 micrometers,and one micrometer is 1000 nanometers.That is,one nanometer is one billionth of a meter.Nano materials are solid materials composed of particles or crystallites of less than 100 nanometer in size.Then,is a cup made of nano material really any different from an ordinary cup in function as far as how it works? Are nano cups really so wonderful?A reporter went to the Institute of Nanomedicine,which is the first such institute of such a sort in the world and the only one in China,specializing in researching the investigation of the application of nano technology into medicine. Ji(director Institute of Nanomedicine): A water molecule is composed of 2 hydrogen atoms and 1 oxygen atom.It can be alterchanged only by special manipulation of the atoms.The material constituting the cup can have a nanometer particles size of the nano level.But it cannot change the chemical and physical properties of the water contained in it.The water in the cup is still water.When people drink it,it will produce no special effect on human body. Prof.Ji told the reporter,so far,the investigation of nano materials is still confined in the laboratory.No commercial micro products can be produced yet.With the present level of science and technology,the time of everyday goods age of daily use articles made of nanometer materials is still years away. The commodities labeled with nano marks in the market now are only traditional products coated with a thin layer of nanometer material,which makes them _ . Prof.Ji explained that nano cup is a real cup.It can also be included in the list of nano products in a certain sense.But the nano cup has not changed its property and function as a cup.It is not a magical medicine for curing and health care.
Answer: nanometer<micrometer<millimeter<meter

A:
Which of the following shows the right relationship?
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