问题
选择题
| 如图所示，一个质子沿abc的轨迹运动，则（ ） A．电势先降低再升高 B．质子的电势能先降低再升高 C．电场力始终做正功 D．电场力先做负功再做正功  |
答案
答案：D
搜题请搜索小程序“爱下问搜题”
| 如图所示，一个质子沿abc的轨迹运动，则（ ） A．电势先降低再升高 B．质子的电势能先降低再升高 C．电场力始终做正功 D．电场力先做负功再做正功 |
答案：D
| 阅读理解 | ||
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| 1. Which of the following statements is TRUE? | ||
| A. Simon wants Tommy to come to the party. B. Tommy wants Simon to come to the party. C. Simon doesn't want Tommy to come to the party. D. Tommy doesn't want Simon to come to the party. | ||
| 2. The party will begin at __________. | ||
| A. 5 p. m on 13th May B. 2 p. m on 13th March C. 2 p.m on 13th May D. 5 p. m on 13th March | ||
| 3. The party will be on for __________. | ||
| A. one hour B. two hours C. three hours D. four hours | ||
| 4. The party will be in __________. | ||
| A. Tommy's home B. Simon's house C. the school D. the park | ||
| 5. Tommy can't come because he will __________ that day. | ||
| A. see a film B. go fishing C. meet his old friends D. be busy working |