题目

选词填空。 A.their    B. gift   C. understand  D.maybe  E. asking  F. Most G.Don’t   H. when  I. answer      J.with    K. for     L. possible    Do you really care about your parents? Hearing this question, most of us may give a quick   1    “Of course, I do.” But  2   you don’t. It is true that all parents can remember clearly   3   to celebrate their children’s birthdays. However, it is a pity that few children know exactly when    4    parents’ birthdays are.    5   parents can easily name the food their children love 计算：（1）（3a2-b）（a2+2b）；（2）(x-13)(x+14)；（3）x（-3x2+2x-1）-x2（2x-6）；（4）x（x-y）-（x-y）（x+y）．