题目

_______was known to us all that Johnson had broken his promise _______ he would give each of us a small gift. A. As ; which    B. What ; that    C. It ; that          D. It ; which   答案：C  考查形式主语及同位语从句。It 作形式主语，that引导同位语从句。  如图为两个物体A和B在同一直线上沿同一方向同时作匀加速运动的v-t图线．已知在第3s末两个物体在途中相遇，则物体的出发点的关系是（　　）A．从同一地点出发B．A在B前3m处C．B在A前3m处D．B在A前5m处