题目

完形填空阅读下面短文，掌握其大意，然后从1-20各题所给的四个选项（A，B，C和D）中，选出最佳选项。 Time talks. It speaks more plainly than words. Time 1 in many ways. Consider the different parts of the day, for example. The time of the day when something is done can give a 2 meaning to the event. It is not a 3 to telephone someone very early in the morning. If you telephone him early in the day, 4 he is shaving or having breakfast, the time of the call shows that something is urgent and 5 immediate attention. The same meaning is 6 telephone calls made a电热饮水机有加热和保温两种工作状态（由机内温控开关S0自动控制），从说明书上收集到如下数据及图所示的电路原理图． 热水箱容量 2L 额定电压 220V 加热时的功率 400W 保温时的功率 40W（1）请分析说明温控开关S0断开时，饮水机处于哪种工作状态？并简单分析原因．（2）求电阻R2的阻值．（3）求电热饮水机在加热状态下的工作电流．（4）电热饮水机在加热状态下的1min消耗的电能．