【正确答案】正确答案： The Beijing-Hangzhou Grand Canal was dug in the Spring and Autumn Period and was built massively in Sui Dynasty and Yuan Dynasty. It extends from Hangzhou in the south to Beijing in the north with an overall length of 1,794 kilometers. As the longest man-made waterway in the world, the Canal and the Great Wall are known as two great projects of ancient China. In 2004, the Canal Museum was built up to display its ancient history. The Grand Canal has made important contribution to the development of China's economy, national unity, social progress and cultural prosperity. Now it has become a new fashion to travel in its surrounding areas. The protection of the Beijing-Hangzhou Grand Canal has extremely vital significance in inheriting human civilization and promoting harmonious development of the society.

【答案解析】解析：1．“它南起杭州，北到北京”可使用extend from．．．to．．．的结构来表达，“全长约1794公里”用“with+名词短语”结构，使句子结构合理，逻辑清晰。 2．“大运河为……做出了重要贡献”可使用make contribution to，“经济发展、国家统一、社会进步和文化繁荣”可用四个名词性词组表达，放在to后面作宾语。 3．在“到运河周边区域旅游已成为一种新的时尚”中，主语“到运河周边区域旅游”较长，可用it作形式主语放在句首，将真正的主语放在后面，避免头重脚轻。 4．“具有极其重大的意义”用has extremely vital significance in…表达，“传承人类文明、促进社会和谐发展”可译为两个动名词词组，作in的宾语，句子结构清晰。