题目

给下列问句选择恰当的答语。⑴What do you do on theweekend? A. I watch TV at 7: 00 p.m.⑵Why are you shoppingtoday? B. I often wash my clothes.⑶When do you watch TV? C. No, I don't. My father is very busy.⑷Do you often playsports with your father? D. My mother was ill. So I am shoppingtoday. 答案：【1】B【2】D【3】A【4】C如图，将质量分别为m1、m2的两个物体放在同一水平桌面上做力跟加速度关系实验，物体与桌面的动摩擦因数分别为μ1、μ2．若用不同的力F分别拉m1、m2两个物体在水平桌面上做匀加速直线运动．现将两组实验测得的结果画在同一个a-F坐标中，得到两条a与F关系图线（1）和（2），则 （　　）A、m1＜m2   μ1＜μ2B、m1＞m2   μ1＜μ2C、m1＜m2   μ1＞μ2D、m1＞m2   μ1＞μ2