详细设计的工具各具优缺点,而PAD图的优点是
A.便于利用走树规则编写程序
B.不受结构化设计的约束
C.易于表达嵌套结构
D.易于确定数据的作用域
参考答案:A
An excellent teacher is believed to be one who devotes himself to the children but ask for nothing ________.
A.in turn
B.in advance
C.in short
D.in return