单项选择题

Lighteningandthunderseemverydifferentfromfog，clouds，rain，wind，heat，andotherthingswhichmakeuptheweather.____11____withoutknowingabouttherestofthe____12____，onecannotunderstandlighteningandthunder.Longago，____13____scientistshadbeguntostudytheweather，everyonewasafraidoflighteningandthunder.____14____theancientGreeksandRomans，thunderwastheangryvoiceof____15____greatgodZeus，orJupiter. Todayweknowmoreaboutweatherand____16____lighteningandthundertoo，thoughthere____17____stillmuchtobelearned.Peopletodayarenotoftenafraidofthunderstorms，thoughweknowthatlightening____18____dangerous.____19____weunderstandlighteningandthunder，thereisathrill（激动）inwatchingasummerthunderstormwhichclearstheairandleavesus____20____.

A．are
B．was
C．is
D．were
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单项选择题
A．in B．about C．on D．of
A．in
B．about
C．on
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A．its B．his C．their D．one‘s
A．its
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