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.

　　1．It happened last night that

　　________． 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

　　2．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.

　　3．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.

　　4．Lighting regulations in Flagstaff, Arizona are put into effect to________．lessen the chance of getting cancer

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