Laughing Gas: New Threat to the Ozone Layer Decades before, scientists discovered that CFCs were making a hole in the ozone laye over Antarctic a (南极洲). This put humankind in (A) ___. In 1989, over 190 nations
Now,the newly discovered four new gases can destroy ozone and are getting into the atmosphere from as yet unidentified sources.Three of the gases are CFCs and one is a hydrochlorofluorocarbon (HCFC),which can also damage ozone.The research has shown that four gases were not around in the ...
Recounts a news briefing at the National Aeronautics and Space Admininstration where two teams of researchers reported finding 'exceptionally high levels' of chlorine monoxide in mid-northern latitudes last month. The finding raised the possibility that the protective layer of ozone could diminish ...
III.阅读理解 阅读下面短文.从每题所给的A.B.C和D项中选出最佳选项.并在答题卡上将该项涂黑.AAgainst 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
阅读理解 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
destroy large areas of forests and pollute the far-off sea ice D. help to gain more energy rather than release more energy 试题答案 在线课程 答案:1.A;2.C;3.D;4.B;5.B; 解析: 根据第一段Against the supposition…scientists have discovered that…可知。
( 甲烷) and ozone.Scientists focus on such signs when they look for life outside of the Earth.These gases can exist in the atmospheres of planets for a long time,allowing scientists to find them with the help of probes.However,it is liquid( 液体) water that is considered to be the ...
about the ozone layer in the mid-1980s when a hole was discovered in the layer above Antarctica during the winter.The hole was caused by chemicals used in refrigerators and air conditioners.When these chemicals are sent out into the atmosphere,they produce gases that destroy the ozone.Concern...
(8分)Scientists from the University of East Anglia have identified four new man-made gases that are contributing to the damage to the ozone(臭氧) layer. Two of the gases are accumulating at a rate that is causing concern among researchers. Worries over the growing ozone hole have seen the ...
.Damage to Ozone layer Gets Worse In the middle of winter, when snow is falling in many parts of the United States, scientists have sounded a warning to people who plan to spend many hours in the sun this summer. The warning is: The sun’s summ