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  3. What do medical researchers usually use to make placebo pills? How many people developed a reaction on both arms in the study i

What do medical researchers usually use to make placebo pills? How many people developed a reaction on both arms in the study i

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问题 What do medical researchers usually use to make placebo pills?
How many people developed a reaction on both arms in the study in Japan?
选项 A、13.
B、9.
C、2.
D、Nobody.
答案C
解析 见第五段。
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