Thomas Edison was born in America. He invented plenty of electric appliances(电器) and people from all over the world know him. At that time, there was no electric lamp in the world. And it brought people much trouble. Young Edison decided to invent it. He didn’t know which material was suited to be a lamp filament(灯丝). He failed and failed and he spent a lot of time on it. Some of his friends asked him to stop the experiments, but he didn’t listen to them and tried his best to find the material.
One afternoon, one of his friends came to visit him, he was doing his experiments in the lab when the man came in. But he only asked his friend to sit down and didn’t stop to talk with him. The man sat for a long time and Edison said nothing to him. His friend was angry with him and said, “You’ve done the experiments 1,200 times but you failed 1,200 times too!”
“You’re right, my friend,” Edison went on doing his experiments and said. “But I’ve known 1,200 materials are not suited to be a lamp filament!”
Why do many people know Edison?

A．Because he was very clever.

B．Because he worked hard.

C．Because he spent much time on his work.

D．Because he invented many electric appliances.

He tried to find a kind of material which was suited to be ______.

A．a lamp

B．a lamp filament

C．a telephone

D．a light

Edison was busy with his work, so ____________.

A．he asked his friend to help him

B．he asked his friend to go back first

C．he didn’t stop to talk with his friend

D．he asked his friend to watch him working

His friend was angry because ____________.

A．he couldn’t persuade Edison to give up

B．Edison didn’t say hello to him

C．Edison failed 1,200 times

D．he didn’t think Edison was polite to him

From the passage, we learn that ___________.

A．Edison was a hard-working person	B．Edison never gave up
C．Edison was rude to friends.	D．Both A and B