Level 66 Level 68
Level 67

31.1 pg 69 write


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mother
母亲
mother
river
知识
knowledge
地理
geography
只要
as long as
成绩
achievement
面积
area
ten thousand
平方
square
公里
kilometer
平方公里
square kilometer
世界
world
人口
population
包括
to include
亿
a hundred million
正确
correct
山峰
mountain peak