单项选择题

There is a difference between what we know, which is our linguistic competence, and how we use this knowledge in actual speech production and______, which is our linguistic performance. ( )

A．creation
B．communication
C．comprehension
D．perception
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单项选择题
XP may contain more than just X. Phrases that are formed of more than one word usually contain head, ______and complement. ( )
A．modifier
B．determiner
C．qualifier
D．specifier
单项选择题
Morphemes which represent such grammatical categories as number, tense, gender, and case are called _______ morphemes. ( )
A．free
B．bound
C．derivational
D．inflectional
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