A．the modern pace B．our interest in shortened operas C．how to make the best use of leisure time D．planning our time scientifically
单项选择题The word sluggard means（）
A．a slow-moving person B．a human being C．a hard worker D．an enemy
单项选择题The main topic of the passage is（）
A．conditions in the work place B．the freedom of industries in the past C．changes in industrial production D．the safety and health of workers and customers
