题目

听第二段长对话，回答问题。 （1） What's the girl's family name? A . Wang Dan. B . Wang. C . Dan. （2） The girl does NOT have _______ in her schoolbag. A . a ruler B . two notebooks C . a pencil box （3） What's her library card number? A . 20160909. B . 25160709. C . 20160709. 答案：B A C15．下列各式能用平方差公式分解因式的是（　　）A．x2+y2B．-x2-y2C．-x2+y2D．x2-y3