题目内容：

Many businesses today use conferences as a means of discussing new plans for company. As people are paying more attention to the environment and green problems, more businesses are looking for ways to reduce their negative effect on the environment. Many businesses do this by using web conferencing.

     Web conferencing is a technology that allows people to communicate more effectively over the Internet. It is an easy way of hosting and attending conferences without having to leave the office. Each of the people involved in a web conference will be posted an invitation to the conference with the time and date of the web conference on it. When the conference is ready to begin, all participants (参与者) must sit at their computer and they will be connected over the Internet.

Obviously, in doing this no fuel is used in traveling to and from a conference, and less work time is taken up in attending a conference.

Any material to be used during the web conference is simply e-mailed to all the participants before the conference. This not only saves paper but also greatly reduces mailing cost 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 used by the participants’ personal computers. Similarly conference organizers don’t have to arrange for food or overnight accommodation (住宿) for participants. All this means that less energy is used.

Many companies actively do many things to reduce their negative impact (影响) on the environment. So web conferencing is much cheaper and greener and more people are willing to host and attend a web conference.

1.What is the passage mainly about?

A. Ways of protecting the environment.

B. Green benefits of web conference.

C. Ways of hosting a web conference.

D. Impacts of web conferencing on costs.

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

C. want to do something to protect the environment

D. haven’t enough money to hold a traditional conference

3. Web conferencing has all of the following advantages EXCEPT _________.

A. saving time                B. promoting understanding

C. saving energy              D. saving paper

4.The participants of a web conference_________.

A. will be e-mailed an invitation before the conference

B. are required to sit in the office together

C. will receive many paper materials

D. must have access to the Internet