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  3. The Antarctic ozone(臭氧)hole is changing weather patterns across the Southern Hemisphere(半球), even affecting the tropics, scienti

The Antarctic ozone(臭氧)hole is changing weather patterns across the Southern Hemisphere(半球), even affecting the tropics, scienti

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问题     The Antarctic ozone(臭氧)hole is changing weather patterns across the Southern Hemisphere(半球), even affecting the tropics, scientists have concluded. The scientists【C1】______the new study added the ozone hole into standard climate models to【C2】______how it might have affected winds and rains. They say rainfall has moved further south【C3】______the pole and the effect has been【C4】______strong over Australia.
    And of【C5】______interest was the southward of the Southern Hemisphere jet stream. These high-altitude winds are【C6】______to determining weather patterns, in both hemispheres. Much of the cold weather felt in the UK【C7】______the last couple of winters, for example, was【C8】______by blocking of the Northern Hemisphere stream.
    The team found that overall, the ozone hole has【C9】______in rainfall moving south along with the winds.【C10】______there are regional differences, particularly concerning Australia. In【C11】______of the average for that zone, the ozone hole【C12】______about a 10% change—but for Australia, it’s about 35%.
    Their modeling indicated that global warming【C13】______greenhouse gas emissions is also a factor in changing rainfall patterns.
    Natural climate cycles are also thought to be important here, as different rainfall patterns were【C14】______in the era before ozone depletion(消耗)and【C15】______20th Century warming.
    Although the【C16】______international organization has significantly checked emissions of harmful substances, they【C17】______for decades in the atmosphere, and so their effects are still being felt. Earlier, an international organization【C18】______that even the Antarctic ozone hole—which is more severe than its【C19】______in the Northern Hemisphere—should be【C20】______by 2045-60.
【C6】
选项 A、beneficial
B、key
C、necessary
D、vital
答案B
解析 考查固定搭配。be key to…“是……的关键”后接名词或动名词，为固定搭配，此处表示high-altitude winds是决定weather patterns的关键；故B最合适。原文to后接的是动词-ing。而necessary／vital的句型是benecessary／vital to do sth．．据此排除这两项。
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