题目

Jack is pleased with ____ you have given him and all ____ you have told him. A. that, what    B. what, that    C. which, what    D. that, which   答案：B 用简便方法计算．1.97×0.25×0.4     （2.5+0.25）×0.8 3.2×12.5     5.71×8.3-5.71×7.3 0.25×0.44     46.23×3.6+6.4×46.23．