题目内容:
Paragraph4________.
A.Whyareclinicaltrialsdone? B.Whereareclinicaltrialsconducted?
C.Whoshouldconsiderclinicaltrialsandwhy?
D.Whatshouldpeopleknowbeforeparticipatinginaclinicaltrial?
E.Whatareclinicaltrials?
F.Areclinicaltrialssafe?
参考答案:
答案解析: