单选题
Which of the following, if true, best reconciles the discrepancy between the increase in unemployment and the increase in jobs in the manufacturing industry of Alameda?
A、
Many products that contain microelectronic components are now assembled completely by machine
B、
Workers involved in the various aspects of the manufacturing processes that use microelectronic technology need extensive training
C、
It is difficult to evaluate numerically what impact on job security the introduction of microelectronics in the workplace had before 1979
D、
In 1990 over 90 percent of the jobs in Alameda"s manufacturing companies were filled by workers who moved to Alameda because they had skills for which there was no demand in Alameda prior to the introduction of microelectronics there
E、
Many workers who have retired from the manufacturing industry in Alameda since 1979 have not been replaced by younger workers
【正确答案】
D
【答案解析】
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