A:He lives in London.
B:He's from London.
C:He speaks English.
某同学在百米比赛中,以6.0m/s的速度迅速从起点冲出,到50m处的速度是8.2m/s,在他跑的全程的中间时刻即t1=6.25s时的速度为8.3m/s,最后以8.4m/s的速度冲过终点,他在百米比赛中平均速度的大小为____ m/s.
Tomorrow is Saturday. It will be fine. Sam will play football. Amy will play the piano and Jim will fly kites. Kate will visit her grandma. On Sunday the weather will be sunny. Sam,Amy,Kate and Jim will have a picnic. They are going to take some food and some toys.