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
D．General linguistics
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单项选择题
According to the passage, the author drinks WMAP's findings are ______.
A．epoch-making.
B．incredible.
C．clear-cut.
D．mediocre.
单项选择题
What can we infer from Bahcall's comment
A．WMAP's findings are quite convincing and he accepted them.
B．WMAP will solve all the problems that have puzzled cosmologists.
C．WMAP's findings accord with Einstein's concept of space-time.
D．We may ignore some strange measurements in WMAP's data.
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