题目内容

Many children spend ____time on computer games.

A. too many
B. much too
C. too much

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Many children spend too much time ____computer games.

A. in
B. on
C. for

Many children spend too much time ____playing computer games.

A. in
B. on
C. at

下列物质哪一种是体内氨的储存及运输形式？

A. 谷氨酸
B. 酪氨酸
C. 谷氨酰胺
D. 谷胱甘肽
E. 天冬酰胺

白化症是由于先天性缺乏：

A．酪氨酸转氨酶
B．苯丙氨酸羟化酶
C．酪氨酸酶
D．尿黑酸氧化酶
E. 对羟苯丙氨酸氧化酶