52．According to the first paragraph，one reason that people will have to keep working until 75 is＿＿.
　　[A]overall improvement of people’s health conditions
　　[B]old people’s high qualification
　　[C]the lack of young employees
　　[D]the great need for more employees by new economy
　　53．What does the author say about the situation in 20 0r 25 years?
　　[A]There will be stricter laws and regulations on employment．
　　[B]There will be fewer people who take full～time jobs．
　　[C]There will be more full—time jobs for older employees．
　　[D]There will be more people who work at home and far from each other．
　　54．The word“upheaval”(Line 1，Para．3)most probably means＿＿.
　　[A]achievement
　　[B]flexibility
　　[C]confusion
　　[D]change
　　55．The influence that the shrinking of young people has on economy may include＿＿．
　　[A]the emergence of a mass market centering on the young
　　[B] the shift of the market center from the middle-aged to the young
　　[C]the increase of the population who get to form family
　　[D]the tendency for the market to split into two
　　56．The passage is mainly about＿＿．
　　[A]the population change
　　[B]me shrinking of younger population
　　[C]the change of working style
　　[D]the change of consuming pattern

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