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【单选题】
下列哪组是机体必需氨基酸（ ）A.
赖氨酸．色氨酸．酪氨酸．蛋氨酸
B.
缬氨酸．亮氨酸．丙氨酸．丝氨酸
C.
苏氨酸．赖氨酸．亮氨酸．缬氨酸
D.
色氨酸．蛋氨酸．胱氨酸．甘氨酸
E.
精氨酸．组氨酸．色氨酸．丝氨酸
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