There is yet a population besides professional and amateur star observers that suffers even more from light pollution. This population consists of birds, bats, frogs,snakes,etc.For example, outdoor lighting severely affects migrating (迁徙的)birds.According to the International Dark-Sky Association,“100 million birds a year throughout North America die in crashes with lighted buildings and towers.”
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
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