弗洛伊德认为人有两种基本的本能是（）和（）
参考答案：生本能；死本能
鸟类在形态、结构适于飞行的特点是：身体呈______体表被覆羽毛；前肢变为______；呼吸为_________。
用所给单词的适当形式填空。
1. The girl is very quiet and doesn't enjoy _____ (go) to the party.
2. Wei Hua has _____ (curly) hair than Li Hong.
3. Her skirt is _____ (red) than mine.
4. The young man is _____ (unfriendly) than the old man.
5. He is _____ (tall) of the two.
