31. The picture below shows how the cortisol levels rise and fall during the day. From the news, which is a good time for coffee?5ce173186bf1b.jpg 
(A) A.
(B) B.
(C) C.
(D) D.

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統計： A(61), B(67), C(126), D(658), E(0) #1996791

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#3385149
對於很多人來說，從床上喝一杯咖啡是開始一...
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