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
______ is concerned with the social significance of language variation and language use in different speech communities.
A．Psycholinguistics
B．Sociolinguistics
C．Historical linguistics
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According to the passage, the author drinks WMAP's findings are ______.
A．epoch-making.
B．incredible.
C．clear-cut.
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