问题 填空题

某运动员在一次100米比赛中,前5秒钟跑了40米,之后又以12米/秒的速度跑到终点,则这个运动员这次比赛的平均速度为______米/秒.

答案

运动员以12m/s的速度运动的路程:

s2=s-s1=100m-40m=60m,

∵v=

s
t

∴运动员后60m的运动时间:

t2=

s2
v2
=
60m
12m/s
=5s,

运动员百米比赛的时间:

t=t1+t2=5s+5s=10s,

这次比赛的平均速度:

v=

s
t
=
100m
10s
=10m/s;

故答案为:10.

阅读理解

阅读理解。

    Hundreds of years ago there lived a king in a small country. He liked swimming. When summer came,

he always went to another palace by a forest with his guards and returned to the capital in autumn.

    One afternoon the king went swimming in a river in the forest but he didn't tell others about it. He was

very happy when he swam in the water. After that he heard a great noise and saw a big bear coming at

him. He tried his best to run away. He ran and ran and at last he lost his way. He was hungry and tired

when he found an old house. There was an old farmer in it. "It's your king," he said to the old man. "I'm

hungry now. Bring me something to eat quickly!"

    The old man had nothing dear. He only had four eggs. The king ate them and felt better. "How much

must I pay you for that?"

    "Eighteen pounds."

    "How dear they are! Are eggs rare (稀有的) here?"

    "No," answered the old farmer. "We have only one king in our country!"

1. ______, he was happy. [ ]

A. The river was beautiful

B. He was swimming in the water

C. The water was warm

D. The king could swim for a long time

2. When the king saw the bear, he ______. [ ]

A. asked the old farmer to help him

B. cried for help

C. ran away quickly

D. ran outside the forest

3. At last the king found ______. [ ]

A. an old house

B. his guards

C. his capital

D. the bear

4. The king felt better because ______. [ ]

A. he could sleep in the farmer's house

B. the bear couldn't find him

C. he ate four eggs

D. the farmer knew he was a king

5. Which is the best title of the story? [ ]

A. The King and the Old Farmer

B. The King in the Forest

C. The King and the Bear

D. The Kind hearted King

单项选择题