单项选择题

In Western Australia，there are around 450 aircraft maintenance engineers，most of______work in the Perth metropolitan area.

A.them
B.whom
C.which
D.they
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单项选择题
Questions 184-188 refer to the following article.President Barack Obama has issued his call to put global warming at the top of the internationalagenda, pledging to push for coordinated action by the world's biggest countries to tackle problem of climate change.In the speech, the US president on Tuesday laid out a three-pan plan to deal with climate change using the power of his office.He outlined a strategy to cut the US's carbon pollution by reducing emissions from coal-fired power plants; to prepare the US for the impact of climate change, suchas the super storm that ravaged the New Jersey coastline last year, and to lead the world by example in combating changing climate. While no single step can reverse the effects of climate change, the president believes we have a moral obligation to our kids to leave them a planet that's not polluted and White House official said.The coal industry said the proposals could prove devastating-----shares in US coal mining companies have been falling sharply-but Mr. Obama ' s speech was being watched closely around the world.In Europe, where the Eurozone crisis has pushed theclimate change agenda firmly into the political background, environmental campaigners said they hoped Mr.Obama's speech would puncture arguments tackling global warming as bad for the economy.”If you have got the US and China moving, then the argument that the EU is going it alone clearly doesn't stand up to scrutiny anymore, said Tom Brookes of the European Climate Foundation.The president said he would seek to expand new and existing international initiatives,including bilateral initiatives with China, India and other big emissions countries.The Eurozone crisis has caused that_______
A.Peoplebelievedthatdealingwithenvironmentalproblemsisbadfortheeconomy
B.Therehasbeenmoreenvironmentalcampaignersdiscussingabouttheissue
C.Theclimatechangeagendawasinfluencedbypolitics
D.TheEUwasgoingalongwithUSandChina
多项选择题
双线式供暖系统是指对每系统中每一组散热器都具有供水和回水管路的供暖系统，它包括（ ）。
A.水平双线双管供暖系统   
B.单、双管混合式系统
C.垂直双线单管供暖系统   
D.垂直双线双管供暖系统   
E.水平双线单管供暖系统
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