What is the role of the 4th paragraph in the development of the passage?
A.To show that people don't ask for much about their dream job.
B.To show that most people in America are satisfied with their jobs.
C.To offer supporting evidence to the preceding paragraph.
D.To provide a contrast to the preceding paragraphs.
第1题
药物上市前临床研究的局限性不包括()。
A.病例数少
B.研究时间短
C.用药条件控制严格
D.研究目的单纯
E.人与实验动物存在种属差异
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