如图所示，直立于水平地面的矩形筒中靠筒壁放着正方体铁块，其右上方顶着一个光滑的、
题型：选择题
问题：
如图所示，直立于水平地面的矩形筒中靠筒壁放着正方体铁块，其右上方顶着一个光滑的、质量为m的斜劈．则下列判断正确的是（ ）
A．左侧筒壁所受压力可能小于右侧筒壁所受压力
B．只改变矩形筒的宽度时，斜劈对铁块的压力不变
C．只增大斜劈的夹角α，筒底受到的压力变小
D．在斜劈上施加一个竖直向下的力F，有可能使筒向右移动
题型：选择题
Directions: For each blank in the following passage there are four words or phrases marked A,B,C and D. Fill in each blank with word or phrases that best fits the context.
“Everything happens for the best,” my mother said whenever I 36 disappointment. “If you can carry on, one day something good will happen. And you'll realize that it wouldn't have happened if not for that 37 disappointment.”
Mother was right, as I discovered after graduating from college in 1932.I had decided to try out a job in radio, then work my way up to sports 38 . I hitchhiked to Chicago and knocked on the door of every station and got turned down every time.
In one studio, a kind lady told me that big stations couldn’t risk hiring inexperienced person. “Go out in the sticks and find a small station that’ll give you a 39 ,”she said.
I thumbed home to Dixon, Illinois. 40 there was no radio-announcing jobs in Dixon, my father said Montgomery Ward had opened a store and wanted a local 41 to manage its sports department. Since Dixon was where I had played high school football, I 42 . The job sounded just right for me. But I wasn’t hired.
My disappointment must have 43 . “Everything happens for the best,” Mom reminded me. Dad offered me the car to job hunt. I tried WOC Radio in Davenport, Iowa. The program director, a wonderful Scotsman named Peter MacArthur, told me they had already hired an announcer.
As I left his office, my frustration 44 . I asked a1oud, “How can a fellow get to be a sport announcer if he can’t get a job in a radio station?”
I was waiting for the elevator when I heard MacArthur 45 . “What was that you said about sports? Do you know anything about football?” Then he stood me before a microphone and asked me to broadcast an 46 game.
On my way home, as I have many times since, I thought of my mother’s words. I often wonder what 47 my life might have taken if I’d gotten the job at Montgomery Wa
rd.
36. A. faced B. received C. considered D. met
37. A. old B. previous C. early D. original
38. A. layer B. manager C. announcer D. fan
39. A. job B. suggestion C. chance D. advantage
40. A. While B. When C. Which D. So
41. A. worker B. student C. announcer D. athlete
42. A. accepted B. agreed C. applied D. promised
43. A. come B. shown C. disappeared D. brightened
44. A. turned over B. hit over C. boiled over D. took over
45. A. murmuring B. calling C. whispering D. announcing
46. A. forceful B. close C. imaginary D. ordinary
47. A. side B. action C. approach D. direction