第15章 Lesson 15 The Polio Problem
- 跟美國學生同步練閱讀：Smart Reading（英文原版 Grade 8）
- (加)韋恩·埃弗里特
- 410字
- 2017-12-29 13:02:34
Baby Boomers are well aware of a disease named polio. It is unheard of in the United States and other countries today. In the 1950s, polio epidemics swept through the US, killing many and leaving thou...
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