[单选题] Despite the fact that children are still acquiring aspects of their native language through the later years of chilhood, they are normally assumed to have completed the greater part of the language acquisition process by the age of ______.

1、[判断题]The syntactic category of the specifier differs depending on the category of the head. If the heads are Ns, the specifiers are determiners. If the heads are Vs, the specifiers are qualifiers and if the head are As or Ps, then the specifiers are degree words.

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2、[判断题]In such sound combinations as / pɪt/, /ˈpeɪpə/ and / pleɪn/, the voiceless stop /p/, occurring in the first position, is unaspirated, i.e. pronounced with the strong puff of air withheld to some extent.

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3、[判断题]It has been found that the absence of the suffix of third-person present-tense singular form of verbs and the non-standard use of double negation like I can’t eat nothing are not correlated with the social status of the speaker.

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4、[判断题]The speech organs located in the oral cavity are the tongue, the uvula, the soft palate, the hard palate, the teeth ridge, the teeth and lips.

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5、[名词解释]Register

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