正歌剧
参考答案：
是指最早出现于17、18世纪以神话及古代英雄传奇故事为题材的意大利歌剧。一般分为三幕，由宣叙调和咏叹调连缀构成，很少使用重唱及合唱。
用所给单词的适当形式填空。
1. I think this song is _____ (popular) than that one.
2. There are some _____ (different) between us.
3. You speak English as _____ (good) as Tom.
4. Ruth isn't as _____ (clever) as her best friend.
5. I have ______ (many) books than you.
判定一项外观设计是否有效，其根据是该设计是否具有（）。
A.创造性
B.实用性
C.新颖性
D.突出性
