1. How long is the Great Wall of China?______
2. When were the walls joined up?______
3. When the enemy invaded, what did the soldiers do on the watchtowers?______
4. How was the Great Wall built?______
5. How do you understand “He who does not reach the Great Wall is not a true man.”?______
More than 20,000 kilometres.
2. When were the walls joined up?______
During the Qin Dynasty.
3. When the enemy invaded, what did the soldiers do on the watchtowers?______
They lit fires as a warning.
4. How was the Great Wall built?______
By hand.
5. How do you understand “He who does not reach the Great Wall is not a true man.”?______
It attracts people around the world.
答案：1. More than 20,000 kilometres. 2. During the Qin Dynasty. 3. They lit fires as a warning. 4. By hand. 5. It attracts people around the world. (答案不唯一)