第30题: [单项选择]Degree of the worker's contribution is greater when ______. A. a factory possesses more experts B. a factory has many small production lines C. workers enjoy more freedom D. workers work at a large production line 参考答案:B 答案解析:第三段第三句、四句“一些汽车工厂正试验采用一些小的而不是大的生产线,这样每个工人在自己的生产线上对汽车的生产贡献更大。”表明,本题的正确答案为B项。