题目

下列实验操作或说法正确的是（ ） A . 某学生用量筒量取液体时，量筒放在水平桌面上，且学生面对刻度，他首先俯视液面读数为79毫升，倾倒出部分液体后，又仰视读数为70毫升，则该生实际倒出的液体的体积应小于9毫升 B . 某同学用广泛pH试纸测得溶液的pH为3.52 C . 某同学欲配制溶质质量分数为8%的食盐水100克，在用托盘天平称量食盐时，他把食盐和砝码的位置放颠倒了（最小的砝码为1克），那么实际上他所配制的食盐水的溶质质量分数小于8% D .根据对话内容，从方框中选择恰当的选项补全对话。其中有两项多余A: Hi Tony! B: No I didn't. What about you， Mary?A: B: What did you do then?A: I helped to wash the dished and……B: I don't like doing the housework A: Not bad. From it I can learn a lot.B: Really? What did you learn from it?A: I learned how to look after （照顾）myself. Maybe you can learn moreB: You're right. I'll try.A. I didn't, either.B. How do you like it?C. Why don't you try it?D. How can we get there?E. What do you do on weekends?F. Did you go camping last weekend?G. I helped to do the housework at home.