选材规范、标准演练;循序渐进、梯度提升;题量丰富、有效提高;技巧同步、一语中的;缩略速记，全面覆盖。 Thecauseofthunderhasbeenasubjectofdiscussionforalongtime. InthethirdcenturyBC, itwasbelievedthat 1.__________. However, themostacceptedtheorywasdevelopedinthe 20thcentury. Accordingtothistheory, theboltsoflightningareveryhot, 2.__________. Whenthishightemperaturebolthitsthesurroundingair, thereis 3.__________, sendingoutashockwave, whichwehearasasoundofexplosion. Thus, thunderiscaused 4.__________, nearthestrokeoflightning 5.____________. Incasethatyouareoutsideduringathunderstorm, itisadvisabletoavoidopenfields, beachesandlakesandalso 6.__________. Thesafestwayisto 7.__________ orstayinthecar. 注意填横线处的短句，一行一个短句。
thunderiscausedduetocollisionofcloudsmuchhotterthanthesurfaceofthesunaninstantexpansionoftheairduetorapidheatingandcoolingoftheairThundercanbedangerousstayawayfromtalltreesgetinsideyourhome
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