2. 外语
  3. What do medical researchers usually use to make placebo pills? Placebo pills usually are made of ______.

What do medical researchers usually use to make placebo pills? Placebo pills usually are made of ______.

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问题 What do medical researchers usually use to make placebo pills?
Placebo pills usually are made of ______.
选项 A、inactive substance
B、active drug
C、radioactive substance
D、explosive substance
答案A
解析 见第二段第三句。
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