【正确答案】Vigorous online interaction is a major characteristic of China’s Internet development, and the huge quantity of forum posts and blog articles is far beyond that of other countries. China’s websites attach great importance to providing netizens with opinion expression services, among which about 80% provide Bulletin Board Service. According to a sample survey, each day people post over three million messages via forums, news commentary sites, blogs, etc. And over 66% of Chinese netizens frequently post comments and discuss various subjects on the Internet to fully express their opinions and interest appeals. Chinese netizens actively participate in online information communication and production, greatly enriching Internet contents.

【答案解析】1. 第一句中的“交流”指的是交流想法、感情、思想等。重点在交流，而这本质上是一个互动的过程，因此译作interaction最准确：“在世界各国都是难以想象的”意思是说论坛帖文和博客文章的数量远远超过世界其他国家。故可译为is far beyond that of other countries。2. 第二句的后半句是对前半句的进一步解释，所以可以用among which引导的非限制性定语从句来表达。3. 第三句中的“发表言论”也就是发帖子，可译为post messages／comments等。