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问题 填空题

△ABC的周长为20厘米，以△ABC的三条中位线组成的三角形的周长是______厘米．

答案

∵三角形的周长是20，

∴三边中点连线所组成的三角形的三边长均为原三角形的一半，

∴三边中点连线所组成的三角形的周长是：

20
2
=10厘米，

故答案为10．

单项选择题

C


A famous teacher was speaking to the students at our school. He began his lesson by holding up a $100 bill. Then he said to the three hundred students, "Who would like this $100 bill" The students began to put up their hands at once.
Then he said, "I am going to give this $100 to one of you, but first, let me do this. " He then made the bill into a ball. Then he said, "Who wants it now" The hands went back into the air.
"Well," he said, "What if I do this" and he dropped it on the floor and stepped on it. He picked up the dirty, crumpled bill and said, "Who still wants it" Hands went back into the air.
"My friends," he said, "you have learned a valuable lesson today. No matter (无论) what I did to the money, you still wanted it because it did not go down in value (价值). It was still worth $100!"
Many times in our lives, we are dropped, crumpled, and stepped on by the chances we take and the things that happen to us. We feel as if we are worth nothing. But remember, no matter what has happened to yon, you will never lose your value: you are always valuable to those people who love you. Your value doesn’t come from what you do or whom you know, hut WHO YOU ARE.
You are special and valuable. Don’t ever forget it!

Why did the famous teacher use a $100 bill at his lesson ( )

A．Because he wanted to make the bill into a ball.

B．Because he used to drop a bill on the floor and stepped on it.

C．Because he was going to give the bill to one of his students.

D．Because he wanted to make the students know what value was.
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单项选择题

在数据流图中，带箭头的直线表示 (19) 。 两条平行线表示 (20) 。

A．加工
B．外部实体
C．数据流
D．存储
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