国徽中间是五星照耀下的____，周围是谷穗和齿轮 。
平时我们看到的一朵菊花，实际上是（ ）
He wrote many children's books, nearly half of____ were published in the 1990s.
简述《红楼梦》“刘姥姥三进贾府”内容：
如图，下列条件：∠1=∠2；∠3=∠4；∠2+∠3=∠5；∠2+∠3+∠A=180°；∠4+∠1=∠5，能判定AB∥DC有（ ）
