题目

关于质点的位移和路程，下列说法中正确的是（                           ）                                A．  路程是标量，即位移的大小    B．  物体做直线运动时，位移的大小一定等于路程    C．  在某段时间内物体的位移为零，则该物体一定是静止的    D．  在某段时间内物体路程为零，则该物体一定是静止的                                                                  �看图，完成对话。（1）A : Whose ________ is this? B : It's Helen's.（2）A : Whose ________ are they? B : They're Mike's.（3）A: I'd like ________ ________ ________ ________ , please.B: Here you are.（4）A: The ________ are too small. B: You can try this pair on.（5）A: How much is the ________ ? B: Sorry, I don't know.（6）A: What's the time? B: It's ________ ________ .（7）A: What time do you go home? B: I go home at ________ ________ .8.A: ________ ________ ________ now.B: OK.（9）A : Shall we ________ ________ ? B: Good idea.（10）A: It's ________ ________ . B: Yes, it's time to ________ ________ .