谈判过程从确定进行谈判的意向开始至谈判结束为止，一般划分为（）等几个阶段。 A.谈判

关于B细胞和T细胞的叙述，正确的是[ ]

A．两种细胞都只存在于淋巴中

B．B细胞只参与体液免疫，T细胞只参与细胞免疫

C．受抗原剌激后，分化出的记忆细胞的功能相同

D．B细胞和T细胞发挥免疫效应都与吞噬细胞有关

在陡峭的山坡上，难以发育深厚土壤的原因是[ ]

A、地表疏松，物质的迁移速度快

B、地表疏松，物质的侵蚀速率较慢

C、光热条件太差

D、水分条件太差

某省于2008年元旦开通有线电视公共频道，该有线电视台为了提高收视率，每月抽取 2万元的大奖1名。关于该行为下列说法正确的是( )。

A．违反了不正当竞争法

B．有利于电视事业的发展，应该提倡

C．是有限电视台正当的竞争手段

D．属于不正当竞争行为，因为奖金额超过了国家规定的3000元的限制

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.

Unwanted e-mail may ______.

A．cause companies to fail in business

B．cause wanted e-mail messages to lose

C．damage the credit of a company

D．do good to a small company

2013年1月，世界卫生组织正式批准中国食品药品检定研究院生物制品检定所为世卫组织生物制品标准化和评价合作中心。这是全球第七个，也是发展中国家首个世卫组织生物制品标准化和评价合作中心。世卫组织的这一决定（）

①增加了中国在世卫组织的代表权和发言权

②有利于中国与世界各国进行科技交流与合作

③表明中国在国际生物制品领域的竞争力提高

④体现了世卫组织对国际生物制品检定工作拥有管辖主权

A.①②

B.①④

C.②③

D.③④