题目内容
【题目】阅读理解
In early October, thousands of people around the globe stepped outside to gaze at their local night sky. As part of an event called the Great World Wide Star Count, adults and kids looked for one of two constellations (星座) — Cygnus in the Northern Hemisphere and Sagittarius in the Southern Hemisphere. The observers recorded how many stars they saw and how bright the stars were, and then posted their results online.
The Star Count was part of a global effort to help scientists learn more about how light pollution affects our view of the night sky. Whether participants saw thousands of stars — or just a dozen — depended a lot on whether they were surrounded by darkness or by twinkling city lights.
On a clear night, with no clouds, moonlight, or artificial lights to block the view, people can see more than 14,000 stars in the sky, but when people are surrounded by city lights they're lucky to see 150 stars.
If you've ever driven toward a big city at night and seen its glow from afar, you've witnessed light pollution. It occurs when light from streetlights, office buildings, signs, and other sources streams into space and illuminates the night sky. This light makes many stars invisible to people on earth.
Dust and particles of pollution from factories and industries worsen the effects of light pollution. When these particles float into the atmosphere, light ricochets (跳飞) off of them and scatters even more.
Light pollution doesn't only affect star visibility. It can harm wildlife too. Scientists don't entirely understand how animals navigate at night, but it's clear that artificial light can attract them, making them go off course. There's increasing evidence, for example, that migrating birds use sunsets and sunrises to help find their way.
（1）Why do many people look at the local sky?
A.To enjoy the beauty of the stars.
B.To develop their interest in Astronomy.
C.To help scientists do a research on light pollution.
D.To get the exact number of stars in the sky.
（2）When people are surrounded by artificial lights, ________.
A.they can find more stars in the sky
B.the stars might appear more clearly
C.the stars seem to be bigger
D.they can find far fewer stars
（3）The following things make light pollution worse EXCEPT ________.
A.artificial lights
B.stars
C.dust
D.particles
（4）How does light pollution affect birds?
A.It does great harm to their eyes at night.
B.It misleads them the way when they migrate.
C.It can enable them to see their routes clearly.
D.It can make them find their way easily.
【答案】
（1）C
（2）D
（3）B
（4）B
【解析】（1）细节理解题。根据第一段最后一句和第二段第一句可知，他们参加 the Great World Wide Star Count活动的目的是帮助科学家更深入地了解光污染在夜晚对人们视野的影响。
（2）推理判断题。根据第三段可知，正常情况下人们能看到14000颗星星，但是在有人造光时只能看到150颗，所以要少得多。
（3）细节理解题。根据第三段中artificial lights和第五段第一句可排除B项。
（4）推理判断题。根据最后一段可知，人造光吸引鸟类，使它们偏离飞行路线。
