The beginning of our sleep-deficit（缺少）crisis can be traced to the invention of the light bulb a century ago.  Many people consider sleep the least expensive item on his program. From diary entries（记录）and other personal accounts from the 18^th and 19^th centuries, sleep scientists have reached the conclusion that the average person used to sleep about 9.5 hours a night. Even people who think they are sleeping enough would probably be better off with more rest.  “The best sleep habits once were forced on us, when we had nothing to do in the evening down on the farm, and it was dark.” By the 1950s and 1960s, that sleep schedule had been reduced dramatically, to between 7.5 and eight hours, and most people had to wake to an alarm clock.  “Nowadays people cheat on their sleep, and they don’t even realize they’re doing it,” says Dr.  David.  “They think they’re okay because they can get on by 6.5 hours, when they really need 7.5, eight or even more to feel ideally vigorous  (充满活力的).”

VI.写信 (30 points)

21. Suppose you were Jing Chen, working as Customer Service Representative in the Sales Department of Express Trading Co., Ltd.  In order to gain more and richer experience in car sales, you want to change your job and apply for a better position in a bigger trading company. Write a letter of application, applying for a position of Sales Manager. In your letter, make sure to provide some necessary information like your qualifications and your sales experience and also to mention what are attached to your letter, such as your resume and a letter of recommendation from the general manager of the present company. Don’t forget to tell him your phone number 416 -123 -45678.  (150-200 words)