阅读短文，判断下列句子的正误，与短文内容相符的在括号中写"Y"，不相符的写"N"。

    Hello, I'm Lucy. I have got a bike. I go to school by bike.  My mother has got a bike, and she goes to

work by bike, too. My father has got a car.  He goes to work by car. This is Ms Li. She is my English

teacher.  She walks to school.

(     ) 1. Lucy walks to school.

(     ) 2. Her father goes to work by taxi.

( ) 3. Her mother has got a bike.

(     ) 4. Ms Li goes to school by bus.

下列不属于结构化分析的常用工具的是______。

A．数据流图

B．数据字典

C．判定树

D．PAD图