On Saturdays, students are very proud to be         on the street to guide passers-by to obey traffic rules.
A．charactersB．volunteersC．operatorsD．graduates
B

試題分析：A. characters人物，性格，B. volunteers   志愿者，C. operators接線員，操作員，D. graduates畢業(yè)生，句意：在星期六，學(xué)生很自豪能做街上的自愿者指導(dǎo)行人遵守交通規(guī)則。根據(jù)句意選B.
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