题目内容：
We as speakers can build ethos via several ways, including:
A.Mentioning our professional background
B.Mentioning our personal experience or research
C.Building common ground with our audience
D.Developing strong delivery
参考答案：
选择题：We as speakers can build ethos via several ways, including:
- 题目分类：中国大学MOOC慕课
- 题目类型：选择题
- 号外号外：注册会员即送体验阅读点！