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[单选题]21.请阅读Passage 1，完成第1～5小题。 Passage 1 Self-driving vehicles threaten to send truck drivers to the unemployment office.Computerprograms can now write journalistic accounts of sporting events and stock price movements.There are even computers that can grade essay exams with reasonable accuracy,which could revolutionizemy own job.Increasingly,machines are providing not only the “brawn” but the brains,too.And thatraises “the question” of where humans fit into this picture-who will prosper and who won't in thisnew kind ofmachine economyr? Within five years we are likely to have the world's best education,or close to it,online andfree.But not everyone will sit down and go through the material without a professor pushing themto do the work. Your smartphone will record data on your life and,when asked,will tell you what to do,drawing on data from your home or from your spouse and friends if need be.“You’ve thrown outthat bread the last three times you’ve bought it,give it a pass” will be a text message of the future.How about “Now is not the time to start another argument with your wife”? The GPS is just the beginning of computer-guided instruction.Take your smartphone on a date,and it might vibratein your pocket to indicate “Kiss her now.” If you hesitate for fear of being seen as pushy,it may write:“Who cares ifyou look bad? You are sampling optimally in the quest for a lifetime companion.” A lot ofjobs will consist of making people feel either very good or very bad about themselves.Coaches,mentors and disciplinarians will spread to many areas oflife,at least for those of us whocan stand to listen to them.These people will cajole us,fiatter us and shame us into improving ourlives,our work habits and our consumption. Computing and software will make it easier to measure performance and productivity. It will be harder to gloss over our failings and maintain self-deception.In essence everyone will suffer the fate of professional chess players,who will always know when they have lost a game,have an exact numerical rating for their overall performance,and find excuses for failure hard tocome by. Individuals will have many measures of their proficiency.They will have an incentive todisclose that information to get the better job or social opportunity.You'll assume the worst aboutthose who keep secrets,and so openness will reign.Many of us will start to hate the idea of Big Data.
Which of the following is closest in meaning to the underlined word “brawn” in Paragraph 1?
A. JoB.
B. Meat.
C. Physical strength.
D. Mental agility.
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