Countless more animal casualties(伤亡) result from the use of artificial lighting.Clearly，people enjoy the benefits of lighting their evenings, but some scientists think it can be harmful for humans，too.They worry that exposure to light while sleeping can increase a person's chances of getting cancer.

　　Emerald Valley is only one community that is becoming aware of the negative effects of light pollution.For years, Flagstaff, Arizona, has enforced lighting regulations in its city in order to assist astronomers at the Lowell Observatory.Similar efforts have been made worldwide, and a movement is underway to remind us to turn off lights when we are not using them, so that other creatures can share the night.

　　41．It happened last night that

　　________．

　　A. the city's lights affected the meteor watching

　　B．the meteors flew past before being noticed

　　C．the city light show attracted many people

　　D．the meteor watching ended up a social outing

　　42．What do the astronomers complain about?

　　A．Meteor showers occur less often than before.

　　B．Their observation equipment is in poor repair.

　　C．Light pollution has remained unsolved for years.

　　D．Their eyesight is failing due to artificial lighting.

　　43．What is the author concerned about according to Paragraph 4?

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