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                                                                                                      郑人逃暑
       郑人有逃暑①于孤林②之下者，日流影移，而徒衽③以从阴。及至暮，反席于树下。及月流影移，复徒衽以从阴，而患露之濡④于身。其阴逾⑤去，而其身逾湿，是巧于用昼而拙于用夕矣。
     【注释】：①逃暑：避暑，乘凉。②孤林：独立的一棵树。③衽（rěn）：卧席。④濡（rú）：沾湿。⑤逾：同“愈”，更加。

如图所示，长为L的小车置于光滑的水平面上，小车前端放一小物块，用大小为F的水平力将小车向右拉动一段距离s，物块刚好滑到小车的左端．物块与小车间的摩擦力为 f，在此过程中（   ）

(A)

    Lisa is a teacher and her husband is a doctor. They are both very 1and have no time to do all the housework. So she asks her children to do some 2 according to their age. She asks John, the elder brother in the 3, to do the dishes. It is an easy chore 4 the 15-year-old boy. And she asks Dave, her 5 son, to take the dog for a walk every evening. The two boys also have to help 6 the car when it is dirty. And they clean their tables, 7 their beds every day and 8 food in the market every Sunday morning. The boys can cook easy meals 9 their parents are not at home.

    The family of 10 live in a big house 11they do all the housework by themselves. Lisa says, “When I was young, my father wanted us 12 with housework and learn how to 13 ourselves. Now I'm doing it to my kids.” John says, “Doing chores is 14.You can learn important life 15 and responsibility (责任).”