单项选择题

______ modify the meaning of the stem, but usually do not change the part of speech of the original word.

A. Prefixes
B. Suffixes
C. Roots
D. Affixes
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单项选择题
Language change is universal, continuous and, to a considerable extent, ______.
A. regular but not systematic
B. irregular and systematic
C. regular and systematic
D. irregular but systematic
单项选择题
The illocutionary point of ______ has the characteristic that the successful performance of an act of this kind brings about the correspondence between what is said and reality.
A. directives
B. declarations
C. commissives
D. representatives
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