A.managed B.between C.as A. e-mail should be carefully【T7】______ to avoid unclear and inappropriate communication B. is known【T8】______ "spamming" C. This topic is hotly debated【T9】______ experienced Internet users and newcomers Electronic mail has been in widespread use for more than a decade, simplifying the flow of ideas, connecting people from distant offices and eliminating the need for meetings, but【T10】______ . As time goes on and more people surf the Net, the amount of unsolicited e-mail grows. Some folks reasonably assume that cyberspace mirrors many aspects of other forms of communications. It would seem that since telemarketing and direct mail are successfully used as marketing techniques for many businesses, it should follow that direct e-mail or unsolicited e-mail should also work.【T11】______ . Unlike receiving promotional materials through the mail or over the phone, e-mail does carry a cost to the recipient. "Bandwidth" is used every time when an e-mail message is sent and places a load on existing resources. The process of sending unsolicited e-mail to large, untargeted lists, or through mailing list discussion groups or Usenet newsgroups,【T12】______ . Spamming wastes bandwidth. Imagine if it became common practice for businesses to market this way. Not only would it be annoying for many, the load on the system would translate to higher access fees. Unlike regular mail where the sender pays the cost of delivering the mail, e-mail is cheap to send, and in some cases, expensive to receive.

【正确答案】 A

【答案解析】解析：空格所在句的意思应为：电子邮件得到广泛应用已超过十年，它让思想的交流简单便捷，让相隔遥远的办公人员相互联系，让会议的召开失去必要，不过为了避免不明和不当的交流，电子邮件应谨慎使用。所以，A项符合题意。

【正确答案】 C

【答案解析】解析：空格前一句的意思为：情况似乎是，既然电话营销和直接寄送邮件被成功地用作许多企业的营销技巧，因而直接的或主动发送的电子邮件营销也应该可行。空格所在句的意思为：在经验丰富的互联网用户和新用户之间，这个话题争论得很激烈。所以，C项符合题意。

【正确答案】 B

【答案解析】解析：空格前一句的意思为：每次发电子邮件都使用“带宽”，给现有资源带来负担。空格后一句的意思为：发送电子垃圾邮件浪费带宽。试想企业普遍采取这种方式营销的情形。所以，B项“被称为发送‘垃圾邮件’”符合题意。所以，答案是B。