根据短文内容，选择正确答案。
One day a boy was walking along the street. Suddenly he stopped and looked up into the sky.
A young man passed by him. When he saw the boy, he felt curious and looked up, too.
Just then a girl came up and saw them. “Is there anything interesting in the sky?” She thought and looked up, too.
After a while, there were quite some people. They were all interested in the clear blue sky.
Suddenly the boy asked, “Hey, what are all of you looking up at?”
“That’s what we are going to ask you,” said the young man.
“You want to ask me? But I wasn’t looking at anything,” said the boy. “I raised(抬起) my head because my nose was bleeding(流血)”
What was the boy doing one day?
A．He was looking for something in the street.
B．He was looking up into the sky.
C．He was looking up at the plane in the sky.
What does the underlined word “curious” in Chinese mean in the passage?
A．好奇的   B．着急的   C．烦恼的
The girl thought        , so she looked up, too.
A．there was something wrong with the boy.
B．the young man could see nothing in the sky
C．there was something interesting in the sky
The boy looked up into the sky only because       .
A．he liked doing so very much
B．other people also did so
C．something was wrong with his nose
From the passage we can see       .
A．few people were looking up
B．there must be something in the sky
C．the boy did not know why other people looked up into the sky as he did