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  3. Britain’s emissions of greenhouse gases, blamed by many scientists for contributing to global warming, have fallen by 14 percent

Britain’s emissions of greenhouse gases, blamed by many scientists for contributing to global warming, have fallen by 14 percent

admin2014-02-27  27
问题     Britain’s emissions of greenhouse gases, blamed by many scientists for contributing to global warming, have fallen by 14 percent since 1990, according to the latest government report.
    British lakes and rivers are also on the road to recovery from acid rain poisoning, following successful curbs to air pollution from cars and heavy industry.
    The report by the National Atmospheric Emissions Inventory(NAEI)attributed the drop in greenhouse gas emissions to several factors including: the introduction of catalytic converters on cars, a move toward low sulphur and lead-free petrol and a switch to gas from coal and oil in power generation.
    Environment Minister Michael Meacher said the downward trend was welcome, but warned of complacency.
    "Even though these figures are encouraging, we must not be complacent. There are still significant problems where we need to do more, for example, to further reduce greenhouse gases and harmful pollutants(污染物)such as ammonia(氨)and particulate matter," he said in a statement.
    The government has a target to cut greenhouse gases by 23 percent by 2010 on 1990 levels. This is almost double the target of 12.5 percent to which the UK is committed under the Kyoto Protocol and there are signs that emissions are rising as generators return to using coal-fired power stations in the face of rising natural gas prices.
    The Department of Environment Food and Rural Affairs(DEFRA)said substantial curbs on sulphur dioxide emissions across the UK and Europe had cut acid rain by half over the last 12 years. "Damaged freshwater lakes and streams are showing signs of recovery," it said.
    But DEFRA warned of a new threat: "Nitrogen oxides(氮氧化物)and ammonia are the main air pollutants that must be tackled to stop future damage."
    The bulk of Britain’s ammonia emissions come from farm animal manure(粪肥), causing over-enrichment of land and waterways, said the report. Certain species rampage unchecked through this ultra-fertile environment, smothering the slower growing plants beneath them and choking streams and rivers. Nitrogen oxides enter the atmosphere from car exhausts and industry, creating health-damaging ozone and contributing to acid rain.
A. make land and waterways ultra-fertile
B. the unchecked choke of rivers and streams
C. can cause acid rain
D. criticized by various scientists
E. the fuel has undergone a change from coal to gas
F. to reduce the gases by about 12.5%
G. had lowered acid rain by half over the decade
It is certain that air pollution
选项
答案C
解析 从题干的结构看，应该选择以动词开头的选项。从题序上看，应该在文章的开头部分寻找题源：第二段句子中包含的因果关系，成为了本题答案的依据。
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