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一些英语语法问题,It is such decisions that have helped give America&

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一些英语语法问题,

It is such decisions that have helped give America's communications industries their commercial vibrancy; and that vibrancy,in turn,which explains the cultural voice - power of the United States. 
这里的help 后面怎么能接give呢,有help do sth这种用法吗?

it is apparent that discrimination in jobs,housing and an unnumbered variety of human encounters continues to be rife,and requires undeviating political attention. 
这里的an unnumbered variety of human encounters continues,是an后面省略了主语,unnumbered和variety of human encounters是一起修饰主语吗,可不是a varity of是固定搭配吗,那a 又去哪里了呢?

help to do something 是固定搭配,即动词短语.其不定式符号to可保留,也可省略.
全句是主从复和句.It是先导词 ,形式主语.真正主语是that引导的主语从句,that到全句末.jobs,housing 和 unnumbered variety of human encounters是介词in的三个并列宾语.
前二者用逗号,后二者用并列连词and 连接.unnumbered 和of human encounters皆为variety的定语.a variety of 是固定搭配.variety是名词,前可有修饰成分,此处unnumbered既是.因其第一个字母u元音发音音标是元音[阿] (注:类似音),所以,不定冠词a其后加个n ,变成an.