题目

图11-2-4（a）是演示简谐运动图象的装置，当盛沙漏斗下面的薄木板N被匀速地拉出时，摆动着的漏斗漏出的沙在板上形成的曲线显示出摆的位移随时间变化的关系，板上的直线OO1代表时间轴.图11-2-4（b）是两个摆中的沙在各自木板上形成的曲线，若板N1和板N2的速度v1和v2的关系为v2=2v1，则板N1、N2上曲线所代表的振动的周期T1和T2的关系为(    ) 图11-2-4A.T2=T1           B.T2=2T1            C.T2=4T1               D.T2=T1/4 阅读下文，掌握其大意，然后从各题所给的四个选项中选出一个最佳答案。     Once upon a time, some children   1   at seaside when they found a turtle (海龟). They began to beat theturtle. Just at that time, a young man came and said to them, "Stop!" The children ran away   2   . The turtle wasvery thankful and said, "Thanks for your   3  . I really would like   4   you to a wonderful palace now."     The young man rode on the back of the turtle and was taken to the secret palace in the sea. When he   5   thepalace, he was very surprised and said to the turtle "  6   nice palace!" To thank him, the king of the turtles gavehim a very   7   dinner. He had never seen   8   a dinner before. He received a warm welcome there and was verypleased   9   everything.     After dinner, the king of the turtles said, "I am going to give you two boxes,   10   you can open only one.""You mustn't open both. Don't forget it!" the turtle warned him. "All right. I will open only one." The young manpromised. At this time, a large wave sent him out of the sea.     After he went back home, he opened the   11   one of the two boxes. To his surprise the box was full of gold."My God!" he cried. "I'm a rich man now." Then he thought, "Things in the other small box must be expensive, too." He could not wait   12  . He broke his promise and opened the other box. As soon as he opened it, he became an old man. His hair turned white. His face looked like an old man over eighty years old. It all happenedin a moment. He was sorry for what he did, but it was too late. (     ) 1. A. played      (     ) 2. A. quickly     (     ) 3. A. kind        (     ) 4. A. to introduce  (     ) 5. A. left for    (     ) 6. A. How         (     ) 7. A. rich        (     ) 8. A. so           (     ) 9. A. to          (     ) 10. A. and         (     ) 11. A. big           (     ) 12. A. no longer  B. were playing  B. slowly        B. helpful       B. to want       B. arrived at          B. How a         B. poor          B. such          B. for           B. but           B. bigger        B. at all       C. play       C. sadly      C. news       C. to invite        C. got on              C. What       C. bad        C. even       C. with       C. or         C. biggest    C. any longer D. will play    D. happily      D. kindness     D. to let       D. went to              D. What a       D. small        D. very         D. in           D. as           D. smaller      D. more