試題詳解

【已刪除】9.How did researchers confirm their theory about the remarkable effect of sugar?
(A)They stopped feeding both groups of mice any more sugar.
(B)They found that both groups of mice lost interest in the sweet food.
(C)They gave both groups of mice a drug that blocks the release of beta-endorphins.
(D)They measured the amount of beta-endorphins released in the blood of the mice.