Question

A lot of language learning，________ has been discovered，is happening in the first year of life，so parents should talk much to their children during that period.(2012·安徽，29)

A．as

B．it

C．which

D．this

Answer 1

A

句意：正如人们所发现的那样，许多语言学习是在生命的第一年进行的，所以在那个时期父母应该多跟孩子说话。考查非限制性定语从句中关系代词的选用。根据句子结构可知，空格处为非限制性定语从句的引导词，先行词为一个句子(即A lot of language learning is happening...)，先行词在定语从句中作主语。当定语从句为被动语态时，常用as作主语来引导定语从句；如果从句中行为动词是主动语态，一般用which作主语。故答案为A项，as意为：正如。