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{"id": "1", "question": "通常来说，组成动物蛋白质的氨基酸有____", "A": "4种", "B": "22种", "C": "20种", "D": "19种", "answer": "C"}
{"id": "2", "question": "血液内存在的下列物质中，不属于代谢终产物的是____。", "A": "尿素", "B": "尿酸", "C": "丙酮酸", "D": "二氧化碳", "answer": "C"}