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【2011·上海市普陀区第二次质量调研】     In recent years many countries of the world have been faced with the problem of how to make their workers more productive. Some experts claim the answer is to make jobs more varied. But do more varied jobs lead to greater productivity? There is evidence to suggest that while variety certainly makes the workers' life more enjoyable, it does not actually make him work harder. As far as increasing productivity is concerned, the variety is not an important factor.     Other experts feel that giving the worker freedom to do his j这块地1面积是f少平方米？