Official 66 Lec1
Question 5 of 6
According to the hypotheses discussed by the professor, what determines how alert we feel at a particular time of the day? Click on 2 answers.

A.

The supply of certain chemicals in our brain

B.

The chemical composition of our diet

C.

Our 24-hour cycle of mental activity

D.

The time of day when we usually wake up

正确答案:AC

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