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?

　　A. Birds may take other migration paths.

　　B．Animals' living habits may change suddenly.

　　C．Varieties of animals will become sharply reduced.

　　D．Animals' survival is threatened by outdoor lighting.

　　44．Lighting regulations in Flagstaff, Arizona are put into effect to________．

　　A．lessen the chance of getting cancer

　　B．create an ideal observation condition

　　C．ensure citizens a good sleep at night

　　D．enable all creatures to live in harmony

　　45．What message does the author most want to give us?

　　A．Saving wildlife is saving ourselves.

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