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【单选题】
乳酸循环是指A.
肌肉内葡萄糖酵解成乳糖，有氧时乳糖重新合成糖原
B.
肌肉从丙酮酸生成丙氨酸，肝内丙氨酸重新变成丙酮酸
C.
外周组织内葡萄糖酵解成乳酸，乳酸在肝异生成为葡萄糖后血中，供周围组织利用
D.
肌肉内蛋白质分解，生成丙氨酸，后者进入肝异生为葡萄糖，葡萄糖再经血液输送到肌肉
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