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物质的结构、性质、用途及保存方法之间有密切的联系，据此回答下列问题．稀有气体在通电时能发出光，可以用作 ；
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阅读短文掌握其大意然后从每小题所给的四个选项中选出一个最佳答案LastnightIwasdrivingfromHarrisburgtoLewisburgadistanceofabout80miles.ItwaslateandIwasdriving36.AtonepointalonganopenhighwayIcametoacrossroadwithatrafficlight.Iwas37ontheroadbynowbutasIcamenearthelightitturned38andIbrakedtoastop.Ilookedleftrightandbehindme.Nothing.Notacarnosuggestion迹象ofheadlights车灯39thereIsatwaitingforthelightto40theonlyhumanbeingforatleastamileinany41.IstartedwonderingwhyI42torunthelight.Iwasnotafraidofbeingcaughtbecausetherewas43nopolicemananywherearoundandtherecertainlywouldhavebeenno44ingoingthroughit.Muchlaterthat45afterI'dmetwithagroupinLewisburgandhadclimbedintobednearmidnightthequestionofwhyI'dstoppedforthatlight46me.IthinkIstopped47 it’spartofacontract契约weallhavewitheachother.It’snotonlythelawbutit'sanagreementwehaveandwetrusteachothertofollow48:wedon’tgothroughredlights.Wedo49 wesaywe’lldo.Weshowupwhenwesaywe'11showup.Iwasso50 ofmyselfforstoppingforthatredlight.AndasnoonewouldeverhaveknownwhatagoodpersonIwasontheroadfromHarrisburgtoLewisburgIhadtotellsomeone. 36.A.fast B.slowly C.carefully D.hard 37.A.late B.alone C.worried D.afraid 38.A.green B.yellow C.red D.dark 39.A.and B.or C.so D.but 40.A.return B.change C.start D.continue 41.A.attention B.background C.direction D.information 42.A.refused B.decided C.prepared D.forgot 43.A.hardly B.luckily C.usually D.clearly 44.A.danger B.excuse C.space D.energy 45.A.moment B.night C.afternoon D.morning 46.A.dependedon B.lookedforwardto C.lookedforwardto D.camebackto 47.A.though B.unless C.because D.until 48.A.me B.it C.him D.us 49.A.what B.how C.why D.That 50.A.tired B.ready C.proud D.sorry
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