One big challenge with placebo responses is that they are ____

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One big challenge with placebo responses is that they are _____: people given the same inert pill or potion may show wildly different reactions, and the effects vary widely according to each person’s illness.

A、capricious
B、illusory
C、unpredictable
D、chimerical
E、marginal
F、ephemeral

答案：A,C

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