题目内容

鸡蛋煮熟后，蛋白质变性失活，这是由于高温破坏了蛋白质的（）

A. 肽键
B. 肽链
C. 空间结构
D. 分子量

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细胞中有哪些脂质？举例说明它们在生命活动中的重要作用。（列出三种即可）

Watch theinterview with Audrey Hepburn and choose the best answer for the following questions.1. Before going to Ethiopia,Audrey Hepburn felt ________________.

A. nervous about what she's going to see
B. afraid of going there
C. emotionalabout what she's going to see
D. eager to go there

Watch the interview with Audrey Hepburn and choose the best answer for the following questions.2. Audrey Hepburn left Ethiopia with a feeling of __________________.

A. hopelessness
B. encouragement
C. depression
D. sadness

Watch the interview with Audrey Hepburn and choose the best answer for the following questions.3. Which is NOT included in some of the human spirits mentioned by Audrey Hepburn?

Arguing with each other
B. Helping each other
C. Living in peace with each other
D. Quarrelling with each other