The proportion of manufacturing companies in Alameda that use microelectronics in their manufacturing processes increased from 6 percent in 1979 to 66 percent in 1990. Many labor leaders say that the introduction of microelectronics is the principal cause of the great increase in unemployment during that period in Alameda. In actual fact, however, most of the job losses were due to organizational changes. Moreover, according to new figures released by the labor department, there were many more people employed in Alameda in the manufacturing industry in 1990 than in 1979.
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?
失业上升，但行业从业人数上升，说明总人数上升，D意思是1990年，阿拉梅达制造业公司超过90% 的工作岗位由移居阿拉梅达的工人填补，因为他们拥有的技能在阿拉梅达引进微电子学之前是没有需求的。 符合
Correct. This suggests that an influx of new workers to Alameda with the new skills needed in manufacturing may in fact have displaced other employees. These people may still live in Alameda yet be jobless.