单选题 Electronic mail has become an extremely important and popular means of communication.
The convenience and efficiency of electronic mail are threatened by the extremely rapid growth in the volume of unsolicited commercial electronic mail. Unsolicited commercial electronic mail is currently estimated to account for over half of all electronic mail traffic, up from an estimated 7 percent in 2001, and the volume continues to rise. Most of these messages are fraudulent or deceptive in one or more respects.
The receipt of unsolicited commercial electronic mail may result in costs to recipients who cannot refuse to accept such mail and who incur costs for the storage of such mail, or for the time spent accessing, reviewing, and discarding such mail, or for both. The receipt of a large number of unwanted messages also decreases the convenience of electronic mail and creates a risk that wanted electronic mail messages, both commercial and noncommercial, will be lost, overlooked, or discarded amidst the larger volume of unwanted messages, thus reducing the reliability and usefulness of electronic mail to the recipient. Some commercial electronic mail contains material that many recipients may consider vulgar or pornographic in nature.
The growth in unsolicited commercial electronic mail imposes significant monetary costs on providers of Internet access services, businesses, and educational and nonprofit institutions that carry and receive such mail, as there is a finite volume of mail that such providers, businesses, and institutions can handle without further investment in infrastructure. Many senders of unsolicited commercial electronic mail purposefully disguise the source of such mail.
Many senders of unsolicited commercial electronic mail purposefully include misleading information in the messages" subject lines in order to induce the recipients to view the messages. While some senders of commercial electronic mail messages provide simple and reliable ways for recipients to reject (or "opt-out" of) receipt of commercial electronic mail from such senders in the future, other senders provide no such "opt-out" mechanism, or refuse to honor the requests of recipients not to receive electronic mail from such senders in the future, or both.
Many senders of bulk unsolicited commercial electronic mail use computer programs to gather large numbers of electronic mail addresses on an automated basis from Internet websites or online services where users must post their addresses in order to make full use of the website or service.
The problems associated with the rapid growth and abuse of unsolicited commercial electronic mail cannot be solved by the government alone. The development and adoption of technological approaches and the pursuit of cooperative efforts with other countries will be necessary as well.
单选题 According to the passage, efficiency of e-mail is threatened by ______.
【正确答案】 D
【答案解析】[解析] 本题考查细节理解。根据文章第二段第一句“The convenience and efficiency of electronic mail are threatened by unsolicited commercial electronic mail”，从第三段得知unsolicited commercial electronic mail指的是unwanted messages。所以，答案是D。
单选题 Which of the following is NOT true about unwanted e-mail?
【正确答案】 B
【答案解析】[解析] 本题考查是非判断。根据文章第三段第一句“The receipt of unsolicited commercial electronic mail may result in costs to recipients who cannot refuse to accept such mail and who incur costs for the storage of such mail, or for the time spent accessing, reviewing, and discarding such mail, or for both.”可知，A、C、D三项均正确；根据此句可知，储存此信息要收费用，因此选项B不正确。所以，答案是B。
单选题 Unwanted e-mail may ______.
【正确答案】 B
【答案解析】[解析] 本题考查细节理解。根据文章第三段第二句“The receipt of a large number of unwanted messages also decreases the convenience of electronic mail and creates a risk that wanted electronic mail messages, both commercial and noncommercial, will be lost, overlooked, or discarded...”可知，收到大量垃圾短信有可能会使有用的信息丢失。所以，答案是B。
单选题 "Pornographic" in Paragraph 3 probably means ______.
【正确答案】 C
【答案解析】[解析] 本题考查词义理解。将解题点定位在第三段最后一句“Some commercial electronic mail contains material that many recipients may consider vulgar or pornographic in nature.”or前后连接的内容也应该相近，因此，pornographic应与or前面的vulgar“粗俗的”近义；decent“正派的，有分寸的”，instructional“指导的，教育的”，sexual“性的”，commercial“商业的”。pornographic“色情的”。所以，答案是C。
单选题 What does unwanted e-mail messages do to the providers of the Internet services?
【正确答案】 A
【答案解析】[解析] 本题考查细节理解。根据文章第四段第一句“The growth in unsolicited commercial electronic mail imposes significant monetary costs on providers of Internet access services, businesses, and educational and nonprofit institutions that...”可知，未加选择的商业电子邮件的增多会增加因特网服务提供商的费用。所以，答案是A。
单选题 "Disguise" in Paragraph 4 is closest in meaning to ______.
【正确答案】 B
【答案解析】[解析] 本题考查词义理解。根据文章第四段最后一句“Many senders of unsolicited commercial electronic mail purposefully disguise the source of such mail.”可知，很多未加选择的商业电子邮件的发送者会故意disguise此类邮件的来源。根据上文可知，未加选择的商业电子邮件有许多危害，所以发送者不希望人们知道信息来源；因此，hide“隐藏，掩饰”符合语境。reveal“展现，揭示”；deliver“递送，陈述”；post“邮递，张贴”；均不正确。disguise“隐瞒，掩饰”。所以，答案是B。
单选题 The word "induce" in Paragraph 5 is closest in meaning to ______.
【正确答案】 A
【答案解析】[解析] 本题考查词义理解。根据文章第五段第一句“Many senders of unsolicited commercial electronic mail purposefully include misleading information in the messages" subject lines in order to induce the recipients to view the messages”可知，很多未加选择的商业电子邮件的发送者会故意包含一些误导人的信息以induce邮件的接收者。cheat“欺骗，骗取”，introduce“介绍”，provide“提供”，harm“伤害”，A项意思符合语境。所以，答案是A。
单选题 "Opt-out" mechanism is probably ______.
【正确答案】 B
【答案解析】[解析] 本题考查细节理解。解题点位于第五段第二句“While some senders of commercial electronic mail messages provide simple and reliable ways for recipients to reject (or "opt-out" of) receipt of commercial electronic mail from such senders in the future, other senders provide no such "opt-out" mechanism, or refuse to honor the requests of recipients not to receive electronic mail from such senders in the future, or both.”分析句子可知，一些垃圾邮件发送者为接收者提供一些简单可靠的方式让他们拒绝在以后受到此类信息，而另一些发送者不提供此类方式。"opt-out" mechanism应指“提供一些简单可靠的方式让他们拒绝在以后受到此类信息”，即接收者有权选择读或是不读此类信息。所以，答案是B。
单选题 It can be inferred from Paragraph 6 that bulk unsolicited commercial e-mail will probably spread ______.
【正确答案】 C
【答案解析】[解析] 本题考查推理判断。根据文章第六段内容可知，未加选择的商业电子邮件的发送者利用电脑程序自动从国际互联网站或在线服务来收集大量的e-mail地址，他们会向这些地址发送unwanted messages，发送这些邮件的目的当然是发送广告。所以，答案是C。
单选题 The unwanted e-mail problem can be solved if ______.
【正确答案】 D
【答案解析】[解析] 本题考查细节理解。根据文章最后一段“The problems associated with the rapid growth and abuse of unsolicited commercial electronic mail cannot be solved by the government alone. The development and adoption of technological approaches and the pursuit of cooperative efforts with other countries will be necessary as well.”可知，A、B两项均不全面；C项内容未提及。只有D项“人们共同的努力和新技术的使用”最全面。所以，答案是D。