苯丙酮酸尿症病人尿中排出大量的苯丙酮酸、苯丙氨酸,因为体内缺乏
A. 酪氨酸转氨酶
B. 酪氨酸羟化酶
C. 苯丙氨酸羟化酶
D. 多巴脱羧酶
E. 磷酸吡哆醛
下列哪组物质是体内氨的运输形式
A. 天冬酰胺和谷氨酰胺
B. 谷胱甘肽和天冬酰胺
C. 丙氨酸和谷氨酸
D. 谷氨酰胺和丙氨酸
E. 丙氨酸和葡萄糖
Life in college is colorful. However, there is a _______ that annoys me most- more and more college studentsare_________online games. Thosegames may befun and _______, but are veryharmfulto those _______.
In my opinion,there are many ________of game addiction.Firstly,online games_________ a lot of players'timefor study. Many of the addicts endup _________ of schoolforpoor _______ performance.