— are the students in your class?
— Most of them are only fourteen.
A：How long
B：How old
C：How many
D：How often
1.2×4＋4=____
1.8×2－3=____
9＋1.2×3=____
5＋3.2×2=____
老师给你布置一项任务，你会（ ）
甲、乙二人进行百米赛跑，当甲到终点时，乙距终点还有10米．如果甲从起点后退10米，他们仍以原速跑，那么二人同时到达终点．
