问题：
[阅读理解] 39. Pillay believes that our brains'shift between being focused and unfocused .
A. can result in psychological well-being
B. can bring about greater efficiency
C. is aimed at better balance in work
D. is driven by task urgency
[阅读理解] 39. Pillay believes that our brains'shift between being focused and unfocused .
A. can result in psychological well-being
B. can bring about greater efficiency
C. is aimed at better balance in work
D. is driven by task urgency
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