Any material to be used during Web conference is simply e-mailed to all the participants before the conference. Participants can then either choose to print material or read it on screen. This not only saves paper but also greatly reduces mailing costs for the business.

　　As a conference hall or business center isn’t being used, it means that the only power that is used is the power that is used by the participants’ personal computers. Similarly, conference organizers don’t have to arrange for food or overnight accommodation. 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.

　　31. 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

　　32. 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.

　　C. want to do something to protect the environment.

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