题目内容

发动机异响主要影响因素不包括()

A. 电压
B. 润滑条件
C. 温度
D. 转速

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To help the listeners connect what they have heard with their own ideas and experience andmove from listening to another skill is () stage.

A. post-listening
B. pre-listening
C. while-listening
D. after-listening

Before listening, it's important to prepare students for listening. What activities can we use in pre-listening stage?

A. Predicting
B. Note-taking
C. Setting the scene
D. Inferring

体内蛋白质和许多重要酶的巯基均直接来自哪种氨基酸

A. 苯丙氨酸
B. 半胱氨酸
C. 胱氨酸
D. 鸟氨酸

蛋白质对波长为280nm的紫外线具有较强的吸收能力，是因为大多数蛋白质含有

A. 酪氨酸
B. 精氨酸
C. 异亮氨酸
D. 甲硫氨酸