The syntactic rules of any language are ______ in number.
C
对于任何一种自然语言，一套句法规则可以产生出无穷多的句子，也就是说，任何语言的句法规则都是有限的，而说话人能够说出和理解的句子的数量是无限的。
ModernEnglishwordsman,woman,child,eat,fight,etc,originatefrom______.
By"languageacquisitionisprimarilytheacquistionofthegrammaticalsystemoflanguage",linguistsmeanthat______.
Lyingundertheskull,thehumanbraincontainsanaverageoftenbillionnervecellscalled______.