[解题导语] 本文介绍了网络会议对保护环境的种种好处。
1．What is the passage mainly about?
A．Ways of protecting the environment. B．Green benefits of Web conferencing.
C．Ways of hosting a Web conference. D．Impact of Web conferencing on costs.
解析：主旨大意题。通读全文可知，文章介绍了网络会议对环保带来的好处，故B项概括了文章的主旨。
答案：B
