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题库 / OG2018V-CR-179
Typically during thunderstorms most lightning strikes carry a negative electric charge; only a few carry a positive charge. Thunderstorms with unusually high proportions of positive-charge strikes tend to occur in smoky areas near forest fires. The fact that smoke carries positively charged smoke particles into the air above a fire suggests the hypothesis that the extra positive strikes occur because of the presence of such particles in the storm clouds.
Which of the following, if discovered to be true, most seriously undermines the hypothesis?
Other kinds of rare lightning also occur with unusually high frequency in the vicinity of forest fires.
The positive-charge strikes that occur near forest fires tend to be no more powerful than positive strikes normally are.
A positive-charge strike is as likely to start a forest fire as a negative charge strike is.
Thunderstorms that occur in drifting clouds of smoke have extra positive-charge strikes weeks after the charge of the smoke particles has dissipated.
The total number of lightning strikes during a thunderstorm is usually within the normal range in the vicinity of a forest fire.
前提：林火上方的烟中带有有正电的微粒
结论：这些出现在风暴云中的微粒可能导致出现更多的正电闪电
A：其他种类的少见的闪电也会在林火附近出现，说明林火可能会致使特定的闪电出现，但是并没有加强或者解释文段中给出的因和果是否有任何关联
BCD无关，本题不讨论是否powerful；什么样的雷会升林火；闪电的数量
D 就算烟中的正电离子消散几个星期后，在飘散的烟中出现的雷电风暴中打的雷还是会带正电，这说明正电闪电的出现不是因为烟中有带正电的微粒，而可能是因为烟本身。
这道题很绕，一定需要把选项看明白。
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