当光辐射增至一定量时，就会对环境及人体健康产生不良影响，这就是“光污染”。在家里，过于光亮的釉面墙砖、墙上装饰的明晃晃的镜面、闪烁的电视屏幕，以及白天大街上熠熠闪光的大楼玻璃幕墙，夜晚如彩虹般闪烁的霓虹灯、商场招牌、灯光广告，都是光污染。曾有一份调查报告显示：全球约有2/3的人生活在光污染中，而且人为光造成的污染逐年增加，如日本每年增加12%。
上述文字主要是说明( )。

A．光辐射都是光污染

B．光污染发生在夜晚

C．光污染发生在公共场所

D．光污染目前很严重

Some young adults want to be independent from their parents as soon as possible. Other young adults prefer to live with their families for a longer time. Which of these situations do you think is better Write an essay with specific reasons and examples to support your opinion.