GRE Reading Comprehension: ETS Official Practice 150-GRE OP150: 阅读 - 3DDF2Q61555UP31XZ

It can be inferred that the author of the passage mentions "automobiles" primarily to suggest that A. Ford's business produced greater profits than did businesses requiring a workweek longer than five days B. Ford, unlike most other employers, encouraged his employees to use the products they produced C. Ford may have advocated shorter hours because of the particular nature of his business D. unions were more likely to negotiate for shorter hours in some businesses than in others E. automobile workers' unions were more effective than other unions in securing a five-day workweek