1.As adults,male golden silk spiders live not in webs of the

1.As adults,male golden silk spiders live not in webs of their own making but rather in webs made by female spiders.这题答案是no error,为什么这里用as是对的?
2.The director’s insistence that there be adequate stage lighting and professionally installed backdrops in the theater was not obstinate but a determination to provide a safe work environment for the actors and stage crew.
A.was not obstinate but a determination
B.was not obstinate but determined
C.was not because of obstinacy,he was determined
D.resulted not from obstinacy,but he was determined
E.resulted not from obstinacy but from a determination
这题选E,为什么不能选B,B不是更简洁吗?
3.The women’s Media Group recently launching an intern program in an effort to encourage minority women to think about careers in publishing and electronic media.
A.The women’s Media Group recently launching an intern program
B.The women’s Media Group recently would launch an intern program
C.Recently launching an intern program,the women’s Media Group
D.The women’s Media Group recently launched an intern program
E.An intern program recently launched by the women’s Media Group
这题选D,为什么不选B?