题目内容

Living creatures are living in harmony the surroundings.

A. within
B. with
C. to
D. of

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The mornings in the forest throb with the dawn chorus of scores of bird voices. Which of the following expessions has the same meaning with the underlined part?

A. are covered with
B. vibrate with
C. deal with
D. are connected with

体内硫酸根主要来自哪种氨基酸

A. Met
B. Cys
C. Trp
D. Phe

白化病是由于先天性缺乏

A. 脯氨酸羟化酶
B. 苯丙氨酸羟化酶
C. 色氨酸羟化酶
D. 酪氨酸酶

S-腺苷甲硫氨酸的重要生理作用是

A. 提供能量
B. 合成胸腺嘧啶
C. 合成非必需氨基酸
D. 甲基供体