题目内容：
Social customs vary somewhat across the country, but in general, people tend to be friendlier and more informal as they invite you as a guest.
参考答案：
选择题：Social customs vary somewhat across the country, b
- 题目分类：西安石油大学-石油工程技术-大学英语I（上）
- 题目类型：选择题
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