Paragraph 2__________ 查看材料A.Are clinical trials saf
材料
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Paragraph 2__________ 查看材料
A.Are clinical trials safe？
B.What are clinical trials？
C.What should people know before participating in a clinical trial？
D.Who should consider clinical trials and why？
E.Where are clinical trials conducted？
F.Why are clinical trials done？
请帮忙给出正确答案和分析，谢谢！