一个钢球冲到一张竖直的木板上，由于钢球的动能，木板上出现了一个裂痕．钢球是怎样获
题型：问答题
问题：
一个钢球冲到一张竖直的木板上，由于钢球的动能，木板上出现了一个裂痕．钢球是怎样获得这个动能呢？
（1）请你设计一个情景，表明钢球的动能是从重力势能转化的，请你把这个情景画在图示中，并在图旁边做出必要的说明．
（2）请你设计另一个情景，表明钢球的动能是从弹性势能转化的，请你把这个情景画在图示中，并在图旁边做出必要的说明．
题型：问答题
阅读理解。
Reporter: How long have you been a firefighter?
Wilson: For eight years.
JP Reporter: How did you get started?
Wilson: First, I had to take a lot of tests in two weeks. Then, I went to the firefighter school for four months.
I learned how to put out fires and how to use equipment I also had a full-time training every day!
Reporter: How do you stay safe on the job?
Wilson: I wear special clothing. It helps keep me protected from fire. I also carry an oxygen tank (氧气瓶)
and a mask (面具). They help me to breathe in a smoke-filled building.
Reporter: Are there any new tools that firefighters use?
Wilson: We have a special camera that can see in the dark. It can find heat. That way, we can exactly tell
the place of a fire.
Reporter: Do you save pets?
Wilson: Just three days ago, I helped save some cats. They were hiding under the beds. Pets usually hide
during a fire because they are afraid of danger.
Reporter: Do you ever get afraid?
Wilson: No. There is no time to he afraid. I just think about what to do to put out the fire safely.
Reporter: What do you like best about being a firefighter?
Wilson: Helping people!
1. Kate Wilson has done her job for ________.
A. 2 weeks
B. 3 days
C. 4 months
D. 8 years
2. To become a firefighter, Kate Wilson ________ at first.
A. took a lot of tests
B. learned to stay safe
C. saved some animals
D. used fire equipment
3. Kate Wilson says she does not get afraid because ________.
A. she has an oxygen tank
B. she knows how to fight fires
C. she enjoys finding heat
D. she is too busy putting out fires
4. As a firefighter, Kate Wilson likes ________ most.
A. wearing a mask
B. asking questions
C. helping people
D. hiding in smoke
5. What did the reporter make this interview for?
A. To tell people what a firefighter does.
B. To teach people how to prevent fires.
C. To make people want to be firefighters.
D. To show people how a firefighter is trained.