[求助]请教一下两个语法问题

kick

NO.1题目  While studying the chemistry of human body, Dr.Rosalyn Yalow won a Nobel Prize for the
                            A          B                              
research she conducted on the role of hormones.
                  C               D
ANSWER IS B
请问1.human body 一定要加S吗像human being不用压human rights则要。什幺时候要加什幺时候不加呢还是不是错在没加S。
2.Dr.Rosalyn Yalow won a Nobel Prize for the research she conducted on the role of hormones.
原句是不是a. Dr.Rosalyn Yalow won a Nobel Prize for the research
           b.she conducted on the role of hormones in the research
变成Dr.Rosalyn Yalow won a Nobel Prize for the research in which she conducted on the role of hormones.
或Dr.Rosalyn Yalow won a Nobel Prize for the research (that同位格) she conducted on the role of hormones.（可是应该不是同位格，因为the research ≠she conducted on the role of hormones 她在此研究中，为扮演主导贺尔蒙作用。
NO.2题目 both of 跟 both 的用法
1.both of 为pron .  所以只能接代名词？
2.both 为a. ad. Pron. Conj.故均可接。

以上两题if you know the answers plz do reply and thank you

williamd

1, the human body

kick

ya, i see ,it sould be
the chemistry of the human body
thanx

mariezhu

Dr... conducted a research which is focused on the role of hormones, Which means that the topic of the research is about the "role of hormones"