第438章 Lesson 47 Hot Air Balloons
- 跟美国学生同步练阅读：Smart Reading（英文原版 Grade 1-8）
- (加)韦恩·埃弗里特
- 485字
- 2017-12-29 12:36:18
Have you ever wondered what keeps a hot air balloon flying? It is the same principle that keeps food...
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Have you ever wondered what keeps a hot air balloon flying? It is the same principle that keeps food...