问题
单项选择题
假设某商品需求函数为Q=50-10P，则该商品价格从2元变动到4元的价格弧弹性是（）。
A．1.5
B．0.75
C．0.85
D．1
答案
参考答案：A
解析：
弧弹性的计算公式为：
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假设某商品需求函数为Q=50-10P，则该商品价格从2元变动到4元的价格弧弹性是（）。
A．1.5
B．0.75
C．0.85
D．1
参考答案：A
解析：
弧弹性的计算公式为：
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| This morning, I remembered a childhood memory. It made me realize that some of the acts of 1 that we might do naturally might never be 2 by the receivers. I was six years old and in adopted care. My adopted mother was not the 3 of person I would have 4 to stay with. One morning she sent me to the 5 for a sack of flour. On the walk back home I was doing what any six year old would have been doing 6 . Because of that I dropped the sack of flour and it burst 7 spilling (撒) the flour all over the ground. I knew that this meant I would be in big 8 when I got home. So I ran back to the store and asked the clerk 9 could have an empty bag and a scoop so I can 10 up as much of the flour as possible. There was no way I was going home empty 11 . Returning to the scene of the accident, to my 12 , saw a car drive right on top of the flour! There was no 13 of salvaging (救捞) it now! The driver saw the 14 on my face and pulled over. He 15 to me and asked what was wrong. I told him that would 16 get the beating of my life if I went back without the flour I had been 17 for. He took me by the hand and led me back to the store where he 18 me a new sack of flour-and some candy! 19 he wiped my tears and sent me on my way home. I never told my adopted mother about the kind 20 but I'm twenty-three years old now and I still remember him and his kindness. | |||
| ( )1. A. cruelty ( )2. A. remembered ( )3. A. kind ( )4. A. wanted ( )5. A. store ( )6. A. walking ( )7. A. difficulty ( )8. A. unless ( )9. A. close ( )10. A. lift ( )11. A. hand ( )12. A. astonishment ( )13. A. way ( )14. A. sorrow ( )15. A. ran over ( )16. A. always ( )17. A. carried ( )18. A. bought ( )19. A. However ( )20. A. gentleman | B. kindness B. regretted B. type B. hoped B. school B. jumping B. problem B. if B. loose B. put B. bag B. surprise B. chance B. shock B. got off B. accidentally B. sent B. took B. Besides B. uncle | C. danger C. blamed C. pile C. chosen C. factory C. singing C. worry C. as C. open C. gather C. pocket C. horror C. time C. excitement C. came over C. fortunately C. beought C. sold C. Then C. person | D. warmth D. forgotten D.part D. expected D. kindergarten D. playing D. trouble D. while D. tight D. pick D. Head D. sadness D. occasion D. disappointment D. shout at D. probably D. taken D. received D. Still D. man |