问题
选择题
| 如图两个等量异种电荷的连线和中垂线有a、b、c三点，现将一个带负电的检验电荷从a移到b再移到c点，下述说法正确的是（ ） A．电场中c点电势高于b点，b点电势高于a点 B．负电荷在三点受到的静电力方向相同 C．负电荷在c点受到的静电力最大 D．负电荷在三点的电势能Ea＞Eb＞EC  |
答案
BC
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| 如图两个等量异种电荷的连线和中垂线有a、b、c三点，现将一个带负电的检验电荷从a移到b再移到c点，下述说法正确的是（ ） A．电场中c点电势高于b点，b点电势高于a点 B．负电荷在三点受到的静电力方向相同 C．负电荷在c点受到的静电力最大 D．负电荷在三点的电势能Ea＞Eb＞EC |
BC
| 完形填空。 | |||
| Once upon a time, a man punished his 5-year-old daughter for 1 the family's only roll of expensive gold wrapping paper. Money was tight then. The child decorated a shoebox with the gold paper and put it 2 the Christmas tree. The next morning the little girl, filled with 3 brought the gift box to her father and said, "This is for you, Daddy! " 4 he opened the box, the father felt sorry for his earlier action. But when he opened it, he found it was 5 and again his anger broke out. "Don't you know, young lady," he said angrily, " when you give someone a present there should be something inside the package ! " The little girl looked 6 at him with tears rolling from her eyes and said," Daddy, it' s not empty. I blew 7 into it until it was all full. " Her father's face turned red. He fell on his 8 and put his arms around his lovely little girl. He begged her to forgive him for his unnecessary anger. An accident 9 the life of the child only a short time later. It is said that the father 10 that little gold box by his bed for all the years of his life. Whenever he was discouraged or faced difficult problems he would open the box , take out an imaginary kiss. There is no more valuable thing anyone could hold. | |||
| ( )1. A. using up ( )2. A. above ( )3. A. interest ( )4. A. After ( )5. A. empty ( )6. A. happily ( )7. A. love ( )8. A. legs ( )9. A. took ( )10. A. put | B. selling B. under B. tears B. As soon as B. a pair of shoes B. angrily B. luck B. feet B. left B. kept | C. losing C. on C. excitement C. If C. full C. up C. kisses C. back C. brought C. laid | D. stealing D. in D. anger D. As D. a roll of gold paper D. down D. wishes D. knees D. carried D. placed |