题目

阅读对话，判断句子正误。A：Hello，Tom.B：Hi，Jenny. How do you feel?A：I feel happy. Look! This is my sister(妹妹). B：What's her name?A：Her name is Kate.B：What colour is her hair?A：Her hair is black.B：What colour are her eyes?A：They are blue.B：How nice(漂亮的)! （1） Jenny is happy. （2） Jenny's sister is Lily. （3） Kate's hair is brown. （4） Jenny's sister is very nice.计算a2(a+b)(a－b)+a2b2