【简答题】翻译: The data on human and animal needs currently available are used by nutrition scientists to establish estimates of amounts of essential nutrients per day that will meet the needs of most health peo...
【单选题】Scientists studying the activity of the living brain with widely used new imaging techniques have been missing some of the earliest steps in brain activity because those changes are subtle and are mas...
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