单项选择题
血压的急性调节主要是通过哪项来实现（）
A.肾脏对体液容量的调节
B.肾素-血管紧张素-醛固酮系统的调节
C.压力感受器及交感神经活动的调节
D.低钠饮食
E.以上都不是
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单项选择题
根据下列材料请回答 32～36 题：U.S.Life Expectancy Hits New HighLife expectancy rates in the United States are at an all—time high，with people born in 2005 projected to live for nearly 78 years，a new federal study findsThe finding reflects a continuing trend of increasing life expectancy that began in 1 955，when the average American lived to be 69.6 years old.By 1 995，life expectancy was 75.8 years，and by 2005，it had risen to 77;9 years，according to the report released Wednesday.“This is good news，”said report CO—author Donna Hoyert ，a health scientist at the National Center for Health Statistics.“It’S even beer news that it is a continuation 0f trends，SO it is a long period of continuing improvement.”Despite the upward trend，the United States still has a lower life expectancy than some 40 other countries，according to the U.S.Census(人口普查)Bureau. The country with the longest life expectancy is Andorra at 83.5 years，followed by Japan，Macau，San Marino and Singapore.Much of the increase owes to declining death rates from the three leading causes of death in the country—heart disease，cancer and stroke.In addition，in 2005，the U.S.death rate dropped to an all—time low of less than 800deaths per 100,000.Dr.David Katz。director of the Prevention Research Center at Yale University School of Medicine，said，“News that life expectancy is increasing is，of course，good.But the evidence we have suggests that there is more chronic disease than ever in the U.S.”Adding years to life is a good thing，Katz said.“But adding vital life to years is at least equally important. If we care about living well，and not just longer，we still have our work cut out for us.”he said. 第 31 题 Since 1 955, life expectancy rates in the U.S. haveA． moved up and down.B． been declining.C． been on the rise.D． remained steady.
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单项选择题
急性左心衰致命威胁是（）
A.出血
B.室颤
C.奔马律
D.肺水肿
E.酸碱失衡 -
单项选择题
根据下列文章,请回答 46～50 题。 Good Writing Like fine food。good writing is something we approach with pleasure and enjoy from the first taste to the last．__________ (1) Quite the contrary, just as the cook has to undergo an intensive training，mastering the skills of his trade，the writer must sit at his desk and devote long hours to achieving a style. in his writing，whatever its purpose--school work，matters of business，or purely social communication．__________ (2)There are still some remote places in the world where you might find someone to do your business or social writing for you，for a fee．There are a few managers who are lucky enough to have the service of that rare kind of secretary who can take care of all sorts of letter writing with no more than a quick note to work from．__________ (3)We have to write school papers，business papers or home papers．We are constantly called on to put words to paper．It would be difficult to count the number of such words，messages，letters。and reports put to the mails or delivered by hand，but the daily figure must be enormous．__________ (4)We want to arouse and hold the interest of readers．We want whatever we write to be read，from first word to last。not thrown into some “letters-to-be-read” file or into a wastepaper basket．__________ (5) A．But for most of US，if there is any writing to be done，we have to do it ourselves．B．However, the managers may sometimes cause the writers a lot of trouble．C．Any good writers，like good cooks，do not suddenly appear full-blown(成熟的)．D．What is more，everyone who writes expects，or at least hopes，that his writing will be read．E．This is the reason we bend our efforts toward learning and practicing the skills of interesting，effective writing．F．You may be sure that the greater the effort，the more effective the writing，and the more rewarding． 第 46 题 请选择（1）处最佳答案。
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