问题
单项选择题
校运动会上某初中同学参加100m短跑比赛，起跑后8s时速度为6.0m/s，到达终点时速度为14.0m/s，比赛成绩是16.0s，则他全程的平均速度的大小为（）
A.6.0m/s
B.7.0m/s
C.6.25m/s
D.14.0m/s
答案
参考答案：C
解析：
根据平均速度
.和8s、到达终点的速度无关
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校运动会上某初中同学参加100m短跑比赛，起跑后8s时速度为6.0m/s，到达终点时速度为14.0m/s，比赛成绩是16.0s，则他全程的平均速度的大小为（）
A.6.0m/s
B.7.0m/s
C.6.25m/s
D.14.0m/s
参考答案：C
解析：
根据平均速度.和8s、到达终点的速度无关
My daughter performed（表演） on behalf（代表） of her class in the annual（每年的） school concert today. She played so that I could not help cheering her. The very reminded me of her experiences of piano practicing. When she was five, we gave her a piano as a birthday present. With great , she began learning it. However, when she was no longer , she became sick of （厌烦）it. , it is a tough job to learn the piano, not to mention the daily routine（常规）of . When her first teacher left, my friend me to an American teacher whose way of teaching was completely American. After practicing, she would give my daughter some comments（评论）, and then point out what should be . Every time she came, beginning the lesson right away, she would first play some . She said, “To learn the piano, you should learn not only the of playing, but more importantly, to the music and love it.” After some time, my daughter became fond of her lessons. Sometimes she would like to a little bit when her skill had reached a certain level. Surprisingly, my daughter said to me one day, “Mom, I was that you didn’t give up my piano lessons. Learning it is like climbing a mountain. You’ll feel when you are on the way. When you look from where you are, you will realize that you have been making . But if you , you’ll never take one more step.” That was the very thing I wanted to teach her.
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