问题
判断题
在采用Black-Scholes模型对欧式权证定价时，可以使用历史波动率(即对数收益率的标准差)度量股价的波动率。( )
答案
参考答案：对
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在采用Black-Scholes模型对欧式权证定价时，可以使用历史波动率(即对数收益率的标准差)度量股价的波动率。( )
参考答案：对
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| This happened years ago when I was a waitress,but I still remember this specific incident so vividly.As the end of the night was__1__,ten minutes before our restaurant closed,a gentleman came in.I was the __2__waitress who got to stay after closing to serve him his food. The customer was quite__3__with how his food was prepared.He sent his__4__back twice.When it eventually arrived to his liking,he__5__some fresh coffee.Meanwhile,my manager and our cooks were __6__me closely,as they wanted the last customer of the__7__to finally leave so that we could__8__the shop and go home. At that time I was frustrated and tired.I also knew he would probably not__9__very well,seeing his inexpensive meal.__10__,I tried to give him good service. Then in the last ten minutes,as I was refilling his coffee,I somehow__11__it on the table as well as his plate.I apologized,but I was__12__to get him another plate of food as everything was shut down in the __13__.Knowing his previous temperament (性情),I had a certain__14__of how he might react.He asked to speak to the manager. But he__15__shocked me at this point.Instead of__16__to my boss,he simply said,"This young lady's done a fine job.You need to keep her__17__as long as you can!" After that he paid his bill and left,and I eagerly went home. The next morning when I came to work and __18__my tips-you often don't get it till the next day __19__a customer charges it on a credit card-I was__20__that thecustomer had offered a $15 tip for his $8 dinner.People are often much nicer than they look! | |||
| ( )1. A. darkening ( )2. A. lucky ( )3. A. pleased ( )4. A. order ( )5. A. changed ( )6. A. following ( )7. A. day ( )8. A. turn up ( )9. A. speak ( )10. A. Instead ( )11. A. spread ( )12. A. eager ( )13. A. kitchen ( )14. A. communication ( )15. A. gradually ( )16. A. explaining ( )17. A. off ( )18. A. held back ( )19. A. unless ( )20. A. convinced | B. approaching B. first B. familiar B. bill B. sold B. checking B. time B. close up B. behave B. Besides B. left B. willing B. rain B. expectation B. fre quently B. apologizing B. around B. brought up B. if B. learned | C. leaving C. unlucky C. interested C. note C. needed C. watching C. place C. set off C. tip C. Otherwise C. spilled C. shameful C. line C. tradition C. rudely C. attending C. away C. picked up C. although C. told | D. happening D. young D. dissatisfied D. mail D. threw D. helping D. room D. turn off D. eat D. However D. broke D. unable D. operation D. hesitation D. really D. complaining D. out D. looked for D. in case D. reminded |