第三节完形填空（共20小题；每小题1.5分，满分30分）
The Colors of Friendship
Once upon a time the colors of the world started to quarrel. Green said, “Clearly I am the most important. I am the sign of life and hope. I was chosen for grass, trees and leaves. Without me, all animals would 21 .”
Blue interrupted, “You only think about the 22 , but consider the sky and the sea.
23 the water that is the basis of life and drawn up by the clouds from the deep sea. Without my peace, you would all be 24 .”
Yellow chuckled (笑道), “You are all so serious. I bring laughter, fun, and 25 into the world.”
Orange started next to blow her trumpet, “I am the color of health and strength. I may be 26 , but I am precious for I serve the needs of human life. When I fill the sky 27 , my beauty is so striking that no one gives another 28 to any of you.”
Red could stand it 29 and he shouted out, “I am the ruler of all of you. I am the color of danger and of bravery. I am willing to 30 truth. I am also the color of passion and of love.”
Then came Purple and Indigo (深蓝) …
The colors went on boasting, each convinced of his or her own 31 . Their quarreling became louder and louder. Suddenly there was a startling flash of bright lightening thunder. Rain started to pour down 32 . The colors crouched (蜷缩) down 33 , drawing close to one another for comfort.
In the midst of the clamor (叫嚷), rain began to speak, “You foolish colors, fighting 34 yourselves, each trying to dominate _35_. Don’t you know that you were each made for a special purpose, _36_? Join hands with _37_ and come to me.”
Doing as they were told, the colors _38_ and joined hands. They formed a colorful rainbow. From then on, whenever a good rain _39_ the world, a rainbow appears in the sky. They remember to _40_ one another.
21. A. stay B. leave C. go out D. die
22. A. earth B. moon C. star D. sun
23. A. That is B. I am C. It is D. This is
24. A. anything B. nothing C. something D. everything
25. A. warmth B. sadness C. depression D. anxiety
26. A. usual B. normal C. common D. scarce
27. A. at midnight B. at noon or at night C. at sunrise or sunset D. during the day
28. A. gift B. honor C. thought D. respect
29. A. for more B. any more C. very much D. no longer
30. A. turn to B. fight for C. struggle with D. bend over
31. A. superiority B. disadvantages C. inferiority D. weakness
32. A. gently B. quietly C. violently D. peacefully
33. A. with care B. in fear C. by chance D. on purpose
34. A. among B. by C. for D. against
35. A. others B . themselves C. the other D. the rest
36. A. equal and simple B. ordinary and similar C. more or less D.unique and different
37. A. each other B. me C. one another D. them
38. A. combined B. separated C. united D. divided
39. A. cleans B. washes C. brightens D. dampens
40. A. appreciate B. quarrel with C. ignore D. praise
如图所示，质量为M且足够长的木板在光滑的水平面上，其右端有一质量为m、可视为质点的滑块，滑块与木板间的动摩擦因数为μ．劲度系数为k的水平轻弹簧的右端O固定不动，其自由端A与滑块之间的距离为L．现给木板以水平向右的瞬时速度v0，滑块将由静止开始向右运动，与弹簧接触后经过时间t，滑块向右运动的速度达到最大，设滑块的速度始终小于木板的速度，弹簧的形变是在弹性限度内，重力加速度大小为g，不计空气阻力．求：