单项选择题
A．Americans are forced to be efficient against their will B．Americans should do what they are willing to do C．people ought not to work so hard for efficiency D．Americans are at a loss what to do
A．Shortened opera performances. B．Quickened paces of movies. C．Speeded-up work efficiency. D．Working on holidays.
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