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  3. The last two tornado seasons have been the deadliest in a decade, with 206 deaths. Everyone from the insurance industry to Al G

The last two tornado seasons have been the deadliest in a decade, with 206 deaths. Everyone from the insurance industry to Al G

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问题     The last two tornado seasons have been the deadliest in a
decade, with 206 deaths. Everyone from the insurance industry to
Al Gore worry that global warming may be causing more tornado【S1】______
activity. But there’s no baseline for comparison. That’s why we have【S2】______
no accurate record of tornadoes before the 1950s, back when it was
possible for these brief, freakish funnels of air to blow over the
unpopulated areas without a notice.【S3】______
    Tornado warnings have improved over the years; forecasters
can now issue warnings about 18 minutes after touchdown for 75【S4】______
percent of twisters. As longer-term forecasts, the science isn’t there【S5】______
yet, despite that you hear on the nightly news. " Television【S6】______
forecasters cater with the public’s curiosity about extreme weather,"【S7】______
says Michael H. Glantz, a professor at the University of Colorado at
Boulder. Their goal, of course, is to be first with a forecast of
trouble ahead.
    The number of deaths per tornado is greater in the South than
in Tornado Alley(the Great Plains and part of the Midwest)—a
disparity that can’t be explained for storm frequency or severity.【S8】______
Experts say things like terrain, population density, and the number
of mobile homes play a role. And the biggest factor might be timing:【S9】______
"In the Plains," explains Schaefer, "we have a many more clearly【S10】______
defined period of tornado activity, generally from March to late
June. In the Southeast, tornadoes can happen all year long, so
there may be less vigilance. " Research also shows that the South
may have a climatological propensity(倾向)for nighttime storms,
which catch people unawares—asleep in bed. Last year’s two killer
tornado outbreaks in North Carolina landed between 11: 30 p. m.
and 3: 30 a. m.
【S9】
选项
答案And—But
解析 连词误用。上文说“影响死亡人数的因素有地形、人口密度、人口流动性”，下文说“最关键的因素是时间”，可见二者是转折关系。
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