By "language acquisition is primarily the acquistion of the grammatical system of language", linguists mean that ______.
正确答案： D
本题解析：
当我们说语言的习得基本上是语言的语法系统习得的时候，我们并不是说语言的语法系统内的每一个具体的规则都需要习得。实际上，儿童习得的是使言语合乎语法规范所必需的一些具有普遍意义的规则。我们注意到，在生成话语时，儿童倾向使用普遍的语法规则，而排斥个别的不规则的情况。
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.