题目

We all feel it is Jack as well as his wife that ________for their son's bad performance at school. A . are to blame B . is to be blamed C . are to be blamed D . is to blame 答案：D一般一只鸡蛋和一个初中学生的质量分别约为（　　）A．0.5g  60mgB．5g  60gC．50g  60kgD．500g  60t