Douglas, Nancy; National Geographic的图书会按更新时间持续补充，适合从代表作和同主题书继续延展阅读。
Reading Explorer 1
Douglas, Nancy; National Geographic
评分 8.9分
Each unit of "Reading Explorer" contains two reading passages, and an optional video activity. Reading passages cover a wide range of real-world topics covering culture, science, social issues, and tr
