C．Varietiesofanimalswillbecomesharplyreduced.

D．Animals'survivalisthreatenedbyoutdoorlighting.

44．LightingregulationsinFlagstaff,Arizonaareputintoeffectto________．

A．lessenthechanceofgettingcancer

B．createanidealobservationcondition

C．ensurecitizensagoodsleepatnight

D．enableallcreaturestoliveinharmony

45．Whatmessagedoestheauthormostwanttogiveus?

A．Savingwildlifeissavingourselves.

B．Greateffortsshouldbemadetosaveenergy.

C．Humanactivitiesshouldbeenvironmentallyfriendly.

D．Newequipmentshouldbeintroducedforspacestudy.

【要点综述】本文是一篇科普文。主要介绍了城市的光污染对日常生活、天文学家的工作以及动物的生活都产生了消极的影响。在Flagstaff，Arizona已经采取了灯光管理措施。

41．A　细节理解题。根据第一段最后一句“…sobrightenedbythecity'slightsthatitdarkenedthelightofthemeteorspassingoverhead.”可知，昨天晚上由于城市的灯光太亮，影响了人们观看流星。故选A。

42．C　细节理解题。根据第三段“…havebeencomplainingaboutthisproblemfordecades.TheysaythatlightpollutionPventsthemfrom…”可知，天文学家多年来一直在抱怨光污染问题未解决。故选C。

43．D　推理判断题。根据第四段第一、二句“…thatsuffersevenmorefromlightpollution.Thispopulationconsistsofbirds,bats,frogs,snakes,etc.”以及本段最后一句“…100millionbirdsayearthroughout…dieincrasheswithlightedbuildingsandtowers.”可知，第四段作者主要叙述的是动物也受到了光污染的影响，甚至它们的生存也受到了影响。故选D。