下列实例中，属于通过做功改变物体内能的是（）

贺世民从小就失去了双臂，可他在父母的支持和鼓励下，练就了“一脚”好书法，他用自己的人生、事实说明了挫折（    ）

⑴What's this? ____                 A. He's my brother.

⑵How are you? ____              B. It's a pig.

⑶Who is he? ____                  C. Yes，I'm tall.

⑷Where is she? ____             D. I'm fine，thank you.

⑸Are you tall? ____               E. She's in the classroom.

⑹What can you do? ____      F. I can read.

We want students for the school show. If you _________ play the guitar, please talk to Mr. Zhang after school.