面向对象设计方法的特有性质在于它提出了软件设计的3个主要概念,即抽象、信息隐蔽和( )。
A.数据库
B.数据结构
C.系统详细调查
D.编写程序
参考答案:C
选用 am, is, are, was或 were填空。
1. I five then. Now I _ eleven.
2. Her hair short then. But now her hair long.
3. —You so cute then.
—Yes, but I very naughty, too.
4. They ______ young then. They _ very old now.
5. We _ in Grade Two then. Now we in Grade Four.
6. The dog _ small two years ago. It big now.
牛肉:罐头( )
A.桥:桥墩
B.树:树叶
C.鸭毛:羽绒服
D.水:土