{"ok":true,"question":{"id":181647,"question_uuid":"79d328bd-1efd-405e-80ac-8872ff8696b6","job_id":10,"source_file":"冀教版/八下/薛豪Q_18952688822_305.pdf","source_page_start":2,"source_page_end":3,"source_bbox":"[30.0, 766.69, 215.21, 186.88]","subject_code":"math","grade_level":"JUNIOR","tree_code":"KT_JUNIOR_MATH_STANDARD","question_type":"single_choice","canonical_json":"{\"year\": null, \"blocks\": [{\"text\": \"下列函数是正比例函数的是(     )\", \"type\": \"text\"}, {\"type\": \"option\", \"label\": \"A\", \"blocks\": [{\"text\": \"y = 2x\", \"type\": \"text\"}], \"source_bbox\": [30.0, 115.66, 92.66, 137.27], \"source_page\": 3}, {\"type\": \"option\", \"label\": \"B\", \"blocks\": [{\"text\": \"y =\", \"type\": \"text\"}, {\"type\": \"math_inline\", \"latex\": \"2x^{2}\"}], \"source_bbox\": [30.0, 141.94, 105.98, 155.68], \"source_page\": 3}, {\"type\": \"option\", \"label\": \"C\", \"blocks\": [{\"text\": \"y = x + 2\", \"type\": \"text\"}], \"source_bbox\": [30.0, 158.31, 114.5, 171.28], 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