Force other than damaging winds are also at work inside tornadoes. Sometimes, as the turning, jumping funnel(漏斗) passes over a house, the walls and ceiling burst apart as if a bomb had gone off inside. This explosion(爆炸) is caused by the low air pressure at the center of a tornado.
The pressure at the center of a tornado is usually 13 pounds per square inch. However, inside the house the air pressure is normal, about 15 pounds per square inch. The difference of 2 pounds per square inch between the inside and outside pressure may not seem like much. But suppose a tornado funnel passes over a small building that measures 20 by 10 by 10 feet. On each square inch of the building, there is 2 pounds of pressure from the inside that is not balanced by air pressure outside the building. On the ceiling, that adds up to an unbalanced pressure of 57,600 pounds. The pressure on the four walls adds up to 172,800 pounds.
If windows are open in the building, some of the inside air will rush out through them. This will balance the pressure inside and outside the building. But if the windows are shut tightly, the great inside pressure may cause the building to burst.
　　Unfortunately, heavy rain happens in thunderstorms that later produce tornadoes. So, people often shut all windows to protect their property. This may cause far worse damage later.
63. Which of the following is the main topic of the passage?
A. Where tornadoes are formed. 　　      B. When tornadoes usually occur.
C. How tornadoes can be prevented.　　     D. Why tornadoes cause so much damage.
64. According to the passage, tornadoes can destroy building because the _____.
A. force of a tornado increases the air pressure in a building
B. air pressure at the center of a tornado is over 172,000 pounds
C. weight of a tornado can crush a building’s roof when it passes overhead
D. air pressure inside a tornado is less than the air pressure inside a building
65. According to the passage, the pressure on a building during a tornado can be reduced　　　　by _____.
A. closing the windows 　　　　　        B. opening the windows
C. using an electric fan 　　　　          D. making the roof and walls stronger

Several years ago, while attending a communication course, I experienced a most unusual process. The instructor asked us to list 　36 in our past that we felt 　 37　 of, regretted, or incomplete about and read our lists aloud.

This seemed like a very 38 process, but there’re always some 39 souls in the crowd who will volunteer. The instructor then 40 that we find ways to 41 people, or take some actions to right any wrong doings. I was seriously wondering how this could ever 42 my communication.

Then the man next to me raised his hand and volunteered this story: “Making my 43 , I remembered an incident from high school. I grew up in a small town. There was a Sheriff 44 of us kids liked. One night, my two buddies and I decided to play a 45 on him.

After drinking a few beers, we climbed the tall water tank in the middle of the town, and wrote on the tank in bright red paint: Sheriff Brown is a s. o. b. (畜生). The next day, almost the whole town saw our glorious 46 . Within two hours, Sheriff Brown had us in his office. My friends told the truth but I lied. No one 47 found out. ”

Nearly 20 years later, Sheriff Brown’s name 48 on my list. I didn’t even know if he was still 49 . Last weekend, I dialed the information in my hometown and found there was a Roger Brown still listed. I tried his number. After a few 50 , I heard, “Hello? ” I said, “Sheriff Brown? ” Paused. “Yes. ”“Well, this is Jimmy Calkins. ”

“And I want you to know that I did it. ”Paused. “I knew it! ” he yelled back. We had a good laugh and a 51 discussion. His closing words were，“Jimmy, I always felt bad for you 52 your buddies got it off their chest, but you were carrying it 53 all these years. I want to thank you for calling me. . . for your sake. ”

Jimmy inspired me to 54 all 101 items on my list within two years, and I always remember what I learned from the course: It’s never too late to 55 the past wrongdoings.

36. A. something　　　　 B. anything　　 C. somebody　　　　　　 D. anybody

37. A. ashamed　　　　　B. afraid　　　　　C. sure　　　　　　　　　　　D. proud

38. A. private　　　　　　B. secret　　　　　C. interesting　　　　　　 D. funny

39. A. foolish　　　　　 B. polite　　　　　　C. simple　　　　　　　　　D. brave

40. A. expected　　　 B. suggested　　 C. ordered　　　　　　　 D. demanded

41. A. connect with　 B. depend on C. make an apology to　　 D. get along with

42. A. improve　　　　　B. continue　　　C. realize　　　　　　　　 D. keep

43. A. notes　　　　　　 B. list　　　　　　 C. plan　　　　　　　　　　 D. stories

44. A. any　　　　　　　　B. most　　　　　 C. none　　　　　　　　　　D. all

45. A. part　　　　　　　 B. game　　　　　 C. trick　　　　　　　　　 D. record

46. A. view　　　　　　　B. sign　　　　　　 C. attention　　　　　　 D. remark

47. A. also　　　　　　　 B. even　　　　　 C. still　　　　　　　　　　 D. ever

48. A. appears　　　　 B. considers　　 C. presents　　　　　　 D. remembers

49. A. angry　　　　　　 B. happy　　　　 C. doubtful　　　　　　 D. alive

50. A. words　　　　　 B. rings　　　　　　 C. repeats　　　　　　　D. calls

51. A. cold　　　　　　　B. plain　　　　　　 C. nervous　　　　　　　D. lively

52. A. in case　　　　　B. so long as　　 C. unless　　　　　　　　 D. because

53. A. around　　　　　B. out　　　　　　　 C. on　　　　　　　　　　　D. away

54. A. build up　　　 B. make up　　　 C. clear up　　　　　 　D. give up

55. A. regret　　　　　 B. forgive　　　　　C. right　　　　　　　　　 D. punish

I wanted to catch　　 early train，but couldn’t get　　 ride to the station

A an；the　 B不填；the　 C an；不填D the；a