As a conference hall or business center isn't being used，it means that the only power that is used is the power used by the participants' personal computers.Similarly conference organizers don't have to arrange for food or overnight accommodation (住宿) for participants of their conferences. All this means that less energy is used.

　　Often in business some companies actively choose to do business with other companies that do many things to reduce their negative impact on the environment.And Web conferencing helps you show other businesses that you are willing to work hard for the green cause.

　　So Web conferencing is much cheaper and greener and more people are willing to host and attend a Web conference.

　　[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

　　2．According to Paragraph 1，many companies use Web conferencing because they ________.

　　A．are interested in using any new technology

　　B．believe that Web conferencing is more convenient

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