更新时间：2018-07-29 16:18作者：李一老师
EmeraldValleyisonlyonecommunitythatisbecomingawareofthenegativeeffectsoflightpollution.Foryears,Flagstaff,Arizona,hasenforcedlightingregulationsinitscityinordertoassistastronomersattheLowellObservatory.Similareffortshavebeenmadeworldwide,andamovementisunderwaytoremindustoturnofflightswhenwearenotusingthem,sothatothercreaturescansharethenight.
41．Ithappenedlastnightthat
A.thecity'slightsaffectedthemeteorwatching
B．themeteorsflewpastbeforebeingnoticed
C．thecitylightshowattractedmanypeople
D．themeteorwatchingendedupasocialouting
42．Whatdotheastronomerscomplainabout?
A．Meteorshowersoccurlessoftenthanbefore.
B．Theirobservationequipmentisinpoorrepair.
C．Lightpollutionhasremainedunsolvedforyears.
D．Theireyesightisfailingduetoartificiallighting.
43．WhatistheauthorconcernedaboutaccordingtoParagraph4?
A.Birdsmaytakeothermigrationpaths.
B．Animals'livinghabitsmaychangesuddenly.