Lying under the skull, the human brain contains an average of ten billion nerve cells called ______.
正确答案： C
本题解析：
人的大脑位于头盖骨之下，平均包括 100亿个被称为神经元的神经细胞。每个神经元至少和一千到一万个其他的神经元相联系。这些神经参与着数不胜数的微电路性质的活动。这些活动使得感知、思维、交流及其他类型的智力活动成为可能。
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.