______ refers to a sociolinguistic situation: two varieties of a language exist side by side throughout the community, with each having a definite role to play.

单项选择题In the sentence Using a moderately powerful desktop computer running a music composition program and a ’500 synthesizer (paragraph 2), the word moderately has the meaning of ______.

单项选择题The passage suggests that, in eighteenth - century Japan, the office of tax collector ______.