Will there always be 31       water? When you consider how necessary water is to each and every one of us and to all 32     (live) things, and when you observe how man has mismanaged other 33     (nature) resources, you may have reason to worry. Man has badly polluted his sources of water 34    Earth. And he uses more and more water each day. Can man learn to treat 35      (pollute) water for reuse fast enough 36      (keep) pace with the world’s technology and   37    (grow) population?

At the present time there is no serious shortage of water in the United States. Water, however, is not 38     able to meet all the local needs. Some areas, such as the southwestern part of our country, get less rain than 39    . In these areas, water must be brought in from 40      outside. Los Angeles, for example, must obtain its water from sources hundreds of miles away in the Colorado River and the rivers of northern California.

数据表明，我国目前团购网站数量不到2000家，去年高峰时期曾有10000家。但不到一年的时间就淘汰了40%的网站。分析师认为，经过两年竞争，资源逐渐掌握在少数几家手里，市场集中度还将进一步提高，只有极少数网站能够存活下来。活下来的网站会逐渐捡回话语权，毛利会逐渐上抬。这段文字主要介绍了团购行业的：

A．竞争方式

B．经营现状

C．发展趋势

D．市场前景