假如你是李华 你给你的美国笔友Tom写信,询问参加美国高考的相关事宜.你想参加,信中包括：

Dear Tom,
As we all know, the Great Wall is a great building, I am proud of the Great Wall.
First, the Great Wall two thousand years of history; It is located in northern China. East from Shanhaiguan, west to Jiayuguan, total length of 8851.8 km.
Second, the Great Wall is China's ancient people created one of the great miracles on behalf of China's long history.
Third, in the past, the Great Wall was built to withstand enemy attack on the; Today, the Great Wall has become a popular tourist attraction, which every year attracts many tourists from around the world.
Yours,
LiHua