2. 外语
  3. On a clear night, people can see______ Light pollution occurs when______

On a clear night, people can see______ Light pollution occurs when______

admin2012-09-10  46
问题 On a clear night, people can see______
Light pollution occurs when______
选项 A、artificial lights illuminate the night sky.
B、the moon lights up the night sky.
C、too many stars are visible in the night sky.
D、streetlights are turned off.
答案A
解析 根据短文第二段第二句的内容可以得知答案。
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