题目内容：
阅读文章，回答题：We spend our leisure hours efficiently for higher production，live by the clock even when time does not matter，modernize our homes and speed the machinery of living in order thatwecan go to the most places and do the most things in the shortest period of time possible．We tryto eat，sleep，and talk efficiently．Even on holidays andSundays，the efficient man relaxes on timetable with one eye on the clock and the other on an appointment sheet．
To squeeze the most out of each shining hour we have shortened the opera，quickened the pace of the movie and put culture in pocket—sizedpackages．We make the busy bee look like alazy creature，the ant like a sluggard．We livesixty-mile—minute and the great efficiencysmiles．
We wish we could return to that pleasant day when we considered time a friend instead ofan enemy；when we did things willingly and because we wanted to，rather than because our timetable called for it，But that of course would notbe efficiency；and we Americans must beefficient．
The phrase that best expresses the mainidea of this passage is________． A．how to make the best useof leisure time
B．planning our timescientifically
C．the modern pace
D．our interest in shortenedoperas
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