题目内容：
Questionsare based on the following passage．
The author Introduces the topic of the passage by__________．
参考答案：
答案解析：
单选题：Questionsare based on the following passage．The author Intro
- 题目分类：英语六级
- 题目类型：单选题
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The author Introduces the topic of the passage by__________．