适合三到六岁儿童的英语谜语

1、What isclean when it is black and dirty when it is white?什么东西干净的时候是黑的，脏的时候却是白的呢

2、Whatis bigand bright during the day and we can 't seeit at night?什么东西白天的时候有大又亮，晚上我们却看不见呢

3、Iam small.I can fly.I like singing in the am I?我很小，我会飞，我喜欢在天空中唱歌。我是谁