试题要求：
Pillay believes that our brains’ shift between being focused and unfocused ______.
试题来源：2018年考研《英语二》真题及答案解析
试题解析：
答案：B
解析：
答案：[B] can bring about greater efficiency
解析：根据题目中的Pillay believes可得出本题目为细节题中的文中人物观点题型。根据题目中的信息，可以定位到倒数第二段最后一句，明确指出they tend to be more efficient。然后对应选项得出正确答案为B. can bring about greater efficiency。
考点：2018年,Text 4 真题
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