根据以下材料，回答48-51题
Alan Lakein, a time management expert,thinks that nothing is a total waste of time, including doing nothing at times.If you arrange things so that you find time to relax and "donothing", you will get more done and have more fun doing it.
One of his clients, a space engineer,didn't know how to " do nothing ". Every minute of his leisure timewas scheduled with intense activities. He had an outdoor-activities schedule inwhich he switched from skiing to tennis. His girlfriend kept up with him inthese activities, although she would have preferred just to sit by the fire andrelax once in a while. Like too many people, he felt the need to be doingsomething all the time, for doing nothing seemed a waste of time. His"relaxing by the fire" consisted of playing chess, reading magazines,or checking emails.
For an experiment, Alan asked him to"waste" his time for five minutes during one of their sessionstogether. What the engineer ended up doing was relaxing, sitting quietly anddaydreaming.When he was finally able to admit that emotional reasons caused himto reject relaxing as a waste of time, he began to look more critically at thatway of thinking. Once he knew that relaxing was a good use of time, he became less serious about being busyand started enjoying each activity more.
Previously he had been so busy doing thathe had no time to have fun at anything. He began to do less and have more fun.When Alan saw the client about three years later, he still had as busy aschedule as ever, but he was able to balance his activity with relaxing so thathe came back to work Monday morning not feeling tired out from a busy weekendbut refreshed.
What can be inferred from the passageabout "doing nothing"
根据文章第三段最后一句可知，三年后，航天工程师仍有忙碌的工作安排，但他学会了平衡工作时间与放松时间，星期一上班也不再无精打采，工作效率提高了。由此可知，“doing nothing”可以帮助人们提高做事效率，故选D。
