【简答题】缺词填空 In most situations, light helps us see. But nowadays humans are using so much that it is in fact a kind of pollution. When it comes to looking at the night sky, too much light makes it d 小题1: for...
【简答题】阅读理解。 In most situations, light helps us see. But nowadays humans are using too much of it so that it is in fact a kind of pollution. When it comes to looking at the night sky, too much light makes it...