题目

---Your sweater looks nice. Is it made of wool?         ---Yes, and it’s made _____ Shanghai.               A. by            B. in              C. from 答案：B 甲、乙两位同学进行百米赛跑，假如把他们的运动近似看作匀速直线运动，他们同时从起跑线起跑，经过一段时间后他们的位置如图所示，在下图中分别作出在这段时间内两人运动的位移s、速度v与时间t的关系图象，正确的是（      ）                                                                                                                                                                                                                                       　         A．          B．         C．        D．