江西省莲塘一中2017高三英语试卷

概要：Against the supposition that forest fires in Alaska, Canada and Siberia warm the climate, scientists have discovered that cooling may occur in areas where burnt trees allow more snow to mirror sunlight into space．This finding suggests that taking steps to prevent northern forest fires to limit the release of greenhouse gases may warm the climate in northern regions．Usually large fires destroyed forests in these areas over the past decade．Scientists predict that with climate warming, fi

江西省莲塘一中2017高三英语试卷,标签：高三英语教学设计模板,http://www.88haoxue.com
Against the supposition that forest fires in Alaska, Canada and Siberia warm the climate, scientists have discovered that cooling may occur in areas where burnt trees allow more snow to mirror sunlight into space． This finding suggests that taking steps to prevent northern forest fires to limit the release of greenhouse gases may warm the climate in northern regions．Usually large fires destroyed forests in these areas over the past decade．Scientists predict that with climate warming, fires may occur more frequently over the next several centuries as a result of a longer fire season．Sunlight taken in by the earth tends to cause warming, while heat mirrored back into space tends to cause cooling． This is the first study to analyze all aspects of how northern fires influence climate．Earlier studies by other scientists have suggested that fire in northern regions speed up climate warming because greenhouse gases from burning trees and plants are released into the atmosphere and thus trap heat． Scientists found that right after the fire, large amounts of greenhouse gases entered the atmosphere and caused warming．Ozone（臭氧）levels increased, and ash from the fire fell on far-off sea ice, darkening the surface and causing more radiation from the sun to be taken in．the following spring, however, the land within the area of the fire was brighter than before the fire, because fewer trees covered the ground．Snow on the ground mirrored more sunlight back into space, leading to cooling． “We need to find out all possible ways to reduce the growth of greenhouse gases in the atmosphere．” Scientists tracked the change in the amount of radiation entering and leaving the climate system as a result of the fire, and found a measurement closely related to the global air temperature．Typically, fire in northern regions occurs in the same area every 80 to 150 years．Scientists, however, found that when fire occurs more frequently, more radiation is lost from the earth and cooling results．Specifically, they determined when fire returns 20 years earlier than predicted, 0．5 watts per square meter will be sent back into space．The net effect is cooling．Watts are used to measure the rate at which energy is gained or lost from the earth． 68．According to the new findings, taking steps to prevent northern forest fires may _______ ． A．result in a warming climate B．cause the forest fires to occur more frequently C．lead to a longer fire season D．protect the forests and the environment there 69．The following are all the immediate effects after a forest fire EXCEPT _______ ． A．large amounts of greenhouse gases enter the atmosphere B．the levels of ozone which is a type of oxygen increase C．snow on the ground mirrors more sunlight back into space D．ashes from the fire fall on the ice surface and take in more radiation from the sun[ 70．Earlier studies about northern forest fires _______ ． A．analyze all aspects of how northern fires influence climate B．indicate that forest fires will pollute the atmosphere C．suggest that people should take measures to protect environment D．suggest that the fires will speed up climate warming 71．From the passage we can draw a conclusion that forest fires in Alaska, Canada and Siberia may _______ ． A．warm the climate as the supposition goes B．allow more snow to reflect more sunlight into space and thus cool the climate C．destroy large areas of forests and pollute the far-off sea ice D．help to gain more energy rather than release more energy E A space ambassador could be appointed by the United Nations to act as the first point of contact for aliens trying to communicate with Earth. Mazlan Othman,a Malaysian astrophysicist,is set to be tasked with co-ordinating humanity’s response if and when extraterrestrials(外星人) make contact.Aliens who landed on earth and asked:“Take me to your leader”would be directed to Mrs Othman.She will set out the details of her proposed new role at a Royal Society conference in Buckinghamshire next week.The 58-year-old is expected to tell delegates that the proposal has been prompted by the recent discovery of hundreds of planets orbiting other stars,which is thought to make the discovery of extraterrestrial life more probable than ever before.

www.88haoxue.com Mrs Othman is currently head of the UN’s little known Office for Outer Space Affairs(Unoosa).In a recent talk to fellow scientists,she said:“The continued search for extraterrestrial communication,by several entities（机构）,sustains the hope that some day human kind will receive signals from extraterrestrials.“When we do,we should have in place a coordinated response that takes into account all the sensitivities related to the subject.The UN is a ready-made mechanism for such coordination.” Opinion is divided about how future extraterrestrial visitors should be greeted.Under the Outer Space Treaty on 1967,which Unoosa oversees,UN members agreed to protect Earth against contamination by alien species by“sterilising”them.Mrs Othman is understood to support a more tolerant approach. But Professor Stephen Hawking has warned that alien interlopers should be treated with caution.He said:“I imagine they might exist in massive ships,having used up all the resources from their home planet.The outcome for us would be much as when Christopher Columbus first landed in America,which didn’t turn out very well for the Native Americans.” 72. This passage is mainly about the fact that___________. A.future extraterrestrial should be greeted B.Matlan Othman, a space ambassador to be appointed C.future extraterrestrial should be treated with caution D.human kind will receive signals from extraterrestrials 73. Which of the following is wrong according to the passage? A.Life may exist on hundred of planets orbiting other stars. B.Some day human kind will get in contact with aliens. C.Sterilising alien specieses is a proper way to protect Earth against contamination. D.Mrs Othman comes from a famous office for Outer Space Affairs. 74. The underlined word "sustains" has the closest meaning with _______. A.strengthens      B.weakens          C.changes           D.suspects 75. In the eyes of Professor Stephen Hawking, _________. A.humans should welcome alien interlopers B.humans should fight with alien interlopers C.the aliens may have a better civilization than humans D.Christopher Columbus wasn't a true hero   第

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