单选题
According to the brain blood flow studies, problem solving ______.
A、
increases blood flow in some areas of the brain
B、
causes changes in the distribution of blood in the brain
C、
demands intense concentration of blood in certain areas
D、
is based on the ability to recite the time
【正确答案】
B
【答案解析】
根据第二段最后一句可知。
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