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  3. The last two tornado seasons have been the deadliest in a decade, with 206

The last two tornado seasons have been the deadliest in a decade, with 206

游客2023-11-24  11
问题     The last two tornado seasons have been the deadliest in a decade,
with 206 deaths. Everyone from the insurance industry to AI Gore worry【S1】________
that global warming may be causing more tornado activity. But there’s
no baseline for comparison. That’s why we have no accurate record of【S2】________
tornadoes before the 1950s. back when it Was possible for these brief,
freakish funnels of air to blow over the unpopulated areas without a【S3】________
notice.
    Tornado warnings have improved over the years；forecasters can
now issue warnings about 18 minutes after touchdown for 75 percent of【S4】________
twisters. As longer-term forecasts, the science isn’t there yet, 【S5】________
despite that you hear on the nightly news. “Television forecasters cater【S6】________
with the public’s curiosity about extreme weather, ”says Michael H.【S7】________
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. Expels say【S8】________
things like terrain, population density, and the number of mobile homes
play a role. And the biggest factor might be timing：“In the Plains, ”【S9】________
explains Schaefer, “we have a many more clearly defined period of【S10】________
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.  [br] 【S4】
选项
答案 after—before
解析 语义错误。该句意为“龙卷风预警已经得到改进，预报可以在龙卷风触地18分钟前发出……。”因此用before，如果用after，不符合逻辑。
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