题目

—You should say sorry to your parents.    —________ . I will talk to them tonight. A．You're welcome          B. You're right C. That's all right            D. Certainly not 答案：B10．如图所示，图（a）是一个铁丝圈，中间松松地系一根棉线；图（b）中是浸过肥皂水的铁丝圈；图（c）是表示用手碰一下棉线一边的肥皂膜；图（d）是表示碰后棉线被拉向另一边，这个实验说明了分子间存在引力．