Lastnight’smeteor(流星)showerleftmanypeopleinthecommunitydissatisfiedanddemandinganswers.AccordingtoGabeRothschild,EmeraldValley’smayor,peoplegatheredinthesuburbsofthecity,carryingheavytelescopes,expecting

　　Lastnight’smeteor(流星)showerleftmanypeopleinthecommunitydissatisfiedanddemandinganswers.AccordingtoGabeRothschild,EmeraldValley’smayor,peoplegatheredinthesuburbsofthecity,carryingheavytelescopes,expectingtowatchthebrightlyburningmeteorspassingthroughthesky.Whattheyfoundinsteadwasaskysobrightenedbythecity’slightsthatitdarkenedthelightofthemeteorspassingoverhead.

　　“Myfamilywassofrustrated,”admittedtownresidentDuaneCosby,“Wewantedtomakethisanunforgettablefamilyouting,butitturnedouttobeahugedisappointment.”

　　Astronomers—scientistswhostudystarsandplanets—havebeencomplainingaboutthisproblemfordecades.Theysaythatlightpollutionpreventsthemfromseeingobjectsintheskythattheycouldseequiteeasilyinthepast.Theycallonpeopleandthegovernmenttotakemeasurestofightagainstit.

　　Thereisyetapopulationbesidesprofessionalandamateurstarobserversthatsuffersevenmorefromlightpollution.Thispopulationconsistsofbirds,bats,frogs,snakes,etc.Forexample,outdoorlightingseverelyaffectsmigrating(迁徙的)birds.AccordingtotheInternationalDark-SkyAssociation,“100millionbirdsayearthroughoutNorthAmericadieincrasheswithlightedbuildingsandtowers.”

　　Countlessmoreanimalcasualties(伤亡)resultfromtheuseofartificiallighting.Clearly,peopleenjoythebenefitsoflightingtheirevenings.Butsomescientiststhinkitcanbeharmfulforhumans,too.Theyworrythatexposuretolightwhilesleepingcanincreaseaperson’schancesofgettingcancer.

　　EmeraldValleyisonlyonecommunitythatisbecomingawareofthenegativeeffectsoflightpollution.Foryears,Flagstaff,Arizona,hasenforcedlightingregulationsinitscityinordertoassistastronomersattheLowellObservatory.Similareffortshavebeenmadeworldwide,andamovementisunderwaytoremindustoturnofflightswhenwearenotusingthem,sothatothercreaturescansharethenight.

　　小题1:Ithappenedlastnightthat_____.A．thecity’slightsaffectedthemeteorwatchingB．themeteorsflewpastbeforebeingnoticedC．thecitylightshowattractedmanypeopleD．themeteorwatching