46. Which of the following is the best title for this passage?
(A) Negative impacts of Placebo sleep
(B) Placebo sleep helps your brain work better
(C) Placebo sleep
and drug testing
(D) Sleep quality and Placebo drugs
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統計: A(14), B(71), C(25), D(34), E(0) #566765
統計: A(14), B(71), C(25), D(34), E(0) #566765