According to the passage, scientists can’t observe...
单选题

According to the passage, scientists can’t observe some of the earliest steps in brain activity becausee.

发布日期:2022-05-17

A.those changes are subtle and masked by some reactions

B.subtle changes in blood flow began earlier

C.the imaging techniques are out of place

D.the flow of blood to increase to an area of the brain is slow

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