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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 烟雾提供了正离子 结论 所以多出来额外的正离子一定是本来就存在于雷云中的。 那这个额外的正电子是不是雷云中存在的呢， 烟雾消失的时候 ，多出的正电子相撞减少了， 说明是这些额外的正离子不是本来就存在的，它们随着烟雾消失了，至于怎么消失，不在不需要考虑， 只是一定存在他因造成的。
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