The syntactic rules of any language are ______ in number.
正确答案： C
本题解析：
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。
Empirical studies show that the process of SLA is a process of constructing and modifying rules of communication.
Research findings have shown that language processing centers are situated in a single area of the left hemisphere.
From the sociolinguistic perspective, a speech variety is no more than a dialectal variety of a language.
The division of English into Old English, Middle English, and Modern English is nonconventional and not arbitrary.
Searle's classification of illocutionary acts is based on the classification of performative verbs.
According to the "principles-and-parameters" theory, "principles" refer to highly abstract properties of grammar which are applied to language in general and which generate phrases and at the same time restrain the power of Move a, while "parameters" allow general principles to operate in certain restricted ways, according to which particular grammars of natural languages vary.
Well-arranged sentences are considered grammatical sentences that are formed following a set of syntactic rules.