With the pandemic（疫情）, unemployment （失业）is very high indeed. In February, at 3.5percent and 5.5 per- cent respectively, unemployment rates（失业率） in Canada and the United States were at generational lows and worker shortages were everywhere.As of（在……时） May, those rates had spiked(迅速上升）up to 13.3 percent and 13.7 percent, and although many worker shortages had disappeared, not all had done so. In the medical field, to take an obvious example, the pandemic meant that there were still clear shortages of doctors, nurses and other medical personnel（人员）.
24.We can learn from Paragraph 3 that there was____________.
A. a call for policy adjustment
B.a lack of medical workers
C. a change in hiring practices
D. a sign of economic recovery
24.【解析】细节题。根据题干信息，直接定位至文章第三段，第三段最后一句“there were still clear shortages of doctors, nurses and other medical personnel.”（医生、护士和其他医疗人员存在短缺），是【B】选项there was a lack of medical workers（医疗工作者缺少）的同义替换。