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Fires can be divided into different （）.
- A、kind
- B、kinds
- C、types
- D、B+C
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Underground Coal FiresCoal burning deep underground in China,India and Indonesia is threatening the environment and human life , scientists have warned.These large-scale______(51)blazes（火焰）cause the ground temperature to heat up and kill surrounding vegetation,produce greenhouse gases and can______(52) ignite（点燃）forest fires , a group of scientists told the annual meeting of the American Association for theAdvancement of Science in Denver.The resulting______(53)of poisonous elements like mercury can also pollute local water sources and soils,they warned."Coal fires are a global disaster,"said Associate Professor Glenn Stracher of East Georgia College inSwainsboro,USA.But______(54)few people know about them.Coal can heat up on its own,and eventually catch fire and bum,if there is a continuous oxygen supply.The heat produced is not caused to______(55)and under the right combinations of sunlight and oxygen,can trigger spontaneous（自发的）catching fire and buming.This can occur underground , in coal stockpiles, abandoned mines or even as coal is transported.______(56)fires in China consume up to 200 million tons of coal per year,delegates were told.In______(57),the U.S.economy consumes about one billion tons of coal annually,said Stracher,______(58)analysis of the likely impact of coal fires has been accepted for publication in the International Journal of Coal Ecology.______(59)underway,coal fires can bum for decades,even centuries.In the process,they release large______(60)of greenhouse gases,poisonous fumes and black particles into the atmosphere.The members of the panel discussed the______(61)these fires may be having on global and regional climate change,and agreed that the underground nature of the fires makes them difficult to______(62).Ultimately,the remote sensing and other techniques should allow scientists to______(63)how much carbon dioxide these fires are emitting（释放）.One suggested______(64)of containing the fires was presented by Gary Colaizzi,of the engineering firm Goodson,which has developed a heat-resistant grout（灌浆）,which is designed to be pumped into the coal fire to______(65)the oxygen supply._________59A:Yet B:Unless C:Once D:Although
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共用题干
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qualityC
variabilityD
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foamB
CO2C
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so thatB
by the wayC
in that D
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language accumulatingC
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单选题What is the main idea of Paragraph 4?A
Fires are serious threats to human beings.B
Australian firefighters don‘t put out fires.C
Fires can play an important role I forests.D
It‘s difficult for firefighters to control the fires.
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填空题The UK economy can be divided into three main sectors（）industries,secondary industries and（）industries.
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