The Great Wall posed a barrier to the communication between the north and the south.
举一反三
- The Great Wall stretches from south to north of China.
- The Great Wall of China is over 21,000 kilometers long, further than the distance from the North Pole to the South Pole. ( )
- There is a striking ___between the standards of living in the north of the country and the south.
- The Great Lakes on the border between Canada and the U. S. are the largest group of freshwater lakes in . A: the continent of America. B: the world C: North America D: South America
- Fighting {broke out} between the North and the South. A: 爆发 B: 停止 C: 继续 D: 谈判