题目

彩虹是气象中的一种光学现象。俗语有“东虹日头西虹雨”之说，玲玲在放学的途中看到东方天空出现彩虹，这一天即将出现的天气现象是（） A . B . C . D . 答案：ALast night's meteor(流星) shower left many people in Emerald Valley dissatisfied. They gathered in the suburbs of the city with heavy telescopes，expecting to watch the brightly burning meteors passing through the sky. However, what they found was a sky so brightened by the city's lights that it darkened the light of the meteors passing overhead.“My family was so frustrated，” admitted town resident Duane Cosby, “We wanted to make this an unforgettable family outing，but it turned out to be a huge disappointment.”Astronomers—scientists who study stars and planets—have been complaining about this problem for many years. They say that light pollution prevents them from seeing objects in the sky that they could see quite easily in the past. They call on people and the government to take measures to fight against it.Besides professional and amateur(业余的) star observers, there is yet a population that suffers even more from light pollution. This population consists of birds，bats, frogs, and snakes etc. For example, outdoor lighting severely affects migrating(迁徙的)birds. According to the International DarkSky Association, “100 million birds a year throughout North America die in crashes with lighted buildings and towers. ”Countless animals injuries and deaths result from the use of artificial lighting. Clearly, people enjoy the benefits of lighting their evenings, but some scientists think it can be harmful to humans, too. They worry that exposure to light while sleeping can increase people'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 rules in its city in order to help astronomers with their observations. 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 ________．A. the city's lights affected the meteor watchingB. the meteors flew past before being noticedC. the city’s lights show attracted many peopleD. the meteor watching ended in a social outing【2】According to Paragraph 4, we know that ________．A. birds may take other migration pathsB. animals' living habits may change suddenlyC. varieties of animals will become sharply reducedD. animals' survival is threatened by outdoor lighting【3】Lighting rules in Flagstaff, Arizona are put into effect to ________．A. reduce the chance of getting cancerB. create an ideal observation conditionC. ensure people a good sleep at nightD. enable all creatures to live in harmony【4】What can we learn from the text?A. Saving wildlife is saving ourselves.B. Great efforts should be made to save energy.C. Human activities should be environmentally friendly.D. New equipment should be introduced for space study.