32. 下面那一個酵素之基因,在肌肉細胞經常不表現?(A)丙酮酸羧化酶(pyruvate carboxylase)(B)丙酮酸脫氫酶(pyruvate dehydrogenase)(C)六碳糖激酶(hexokinase)(D)葡萄糖-6-磷酸酶(glucose-6-phosphatase)