题目

选择正确的选项补全对话。Tina: 【1】Sam: It’s Thursday.Tina: 【2】Sam: We have the computer class, music and PE on Thursdays.Tina: 【3】Sam: Yes, I like Thursdays. I like the computer class.Tina: 【4】Sam: I often watch TV on Saturdays. 【5】Tina: I often play sports with my friends. And don't watch TV for a long time.Sam: OK!A.What about you?B.Do you like Thursdays?C.What day is it today?D.What do you have on Thursdays?E.What do you often do on Saturdays? 如图所示，斜面小车M静止 在光滑水平面上，一边紧贴墙壁．若再在斜面上加一物体m，且M、m相对静止，小车后来受力个数为 [　　] A． 3 B． 4 C． 5 D． 6