问题
填空题
由于做功会引起物体能的变化，请你用确切的概念完成下表：
答案
重力势能变化；合外力做的总功；除重力（或弹力）以外的力所做的功；机械能守恒
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由于做功会引起物体能的变化，请你用确切的概念完成下表：
重力势能变化；合外力做的总功；除重力（或弹力）以外的力所做的功；机械能守恒
| 阅读理解。 |
| My friend Joan is a nurse at St. Luke's hospital. She has been a nurse since last September. She is a short pretty girl with large eyes. Joan finds the work interesting, but the hours are very long. Every day she works in a ward (病房) from eight to twelve. She brings the patients (病人) medicine, answers their rings, and tries to be kind to everyone. She likes people even when they are not happy. In the afternoon Joan has a rest. Then four days a week she goes to classes. She is learning first-aid (急救) and chemistry. She is not good at chemistry, but she is good at first-aid work. She is a good nurse. |
| 1. Joan has been a _____ since last September. |
[ ] |
| A. teacher B. worker C. nurse D. driver |
| 2. What does she do in the morning? She _____. |
[ ] |
| A. has a walk B. goes to classes C. brings the patients medicine D. reads books on medicine |
| 3. She _____ even when they are not happy. |
[ ] |
| A. likes children B. likes people C. visits children D. visits people |
| 4. Joan _____ in the afternoon. |
[ ] |
| A. brings the patients medicine B. answers the patients' rings C. goes to classes D. has a rest |
| 5. Joan is good at _____. |
[ ] |
| A. chemistry B. first-aid C. swimming D. Chinese |