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题库 / Prep2007E1-SC-138
According to scientists at the University of Alaska, while the surface temperature of the globe has risen over the last century by about one degree Fahrenheit, the surface temperature in Alaska, Siberia, and northwestern Canada has increased in the previous thirty years by about five degrees.
the surface temperature in Alaska, Siberia, and northwestern Canada has increased in the previous thirty years by about five degrees
the surface temperature in Alaska, Siberia, and northwestern Canada has increased over the last thirty years by about five degrees
there was an increase in the last thirty years by about five degrees in Alaska, Siberia, and northwestern Canada
it had increased in Alaska, Siberia, and northwestern Canada by about five degrees over the previous thirty years
it has increased in Alaska, Siberia, and northwestern Canada over the previous thirty years by about five degrees
in/during/over：
in强调在某个时间点，in 1997；during在……期间，强调时间范围，在某个时间范围里的每一个时间点，如Please remain seated during the performance. 演出期间请不要站起来；over强调时间的跨越，在某个时间里一直/从头至尾
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