题目

As a temporary teacher, my daily routine___21___driving to a new school___22___every day, so I’m usually unable to anticipate (预料) the day’s events, good or bad. On one particular day, I was teaching in a very___23___class. I was managing behavior all the morning and by lunch time, I needed coffee to___24___the afternoon. So at my lunch___25___, I drove to a nearby plaza to get a cup of___26___. Upon returning to the car, I realized I had___27___my keys and my phone___28___. I had about 15 minutes to get back to the school which was a good 4–or–5 minute___29___. I thought of关于分子动理论，下面说法中错误的是：（ ）A．分子之间既有引力，又有斥力B．物质由分子组成，分子间存在空隙C．扩散现象说明分子在做无规则的运动D．粗绳很难被拉断说明分子之间只存在引力