阅读理解。 Bill Gates is the richest person

差额内部收益率是使两个投资额不相等方案各年净现金流量差额的现值之和等于零时的折现率。当△IRR大于基准收益率i_c时，应选择（）。

A．投资额大的方案

B．投资额小的方案

C．无法确定

D．任意选择

男，55岁。缺失，近远中邻牙均向缺隙倾斜，设计固定义齿时应注意（）

A.基牙的支持力

B.义齿的固位力

C.固定义齿类型

D.共同就位道

E.力的大小

Questions 91 — 100 are based on the following passage. (15 points)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.

Which of the following is NOT true about unwanted e-mail

A．It costs money to receive them.

B．It’s free to store them.

C．It takes time to access them.

D．It takes time to throw them away.

下列选项中，不符合联合国《儿童权利公约》，对儿童权利的保护规定的是（）。

A.承认儿童享有固定的生命权

B.确保儿童免受惩罚的权利

C.最大限度的确保儿童的生存与发展

D.确保儿童享有其幸福所需的保护和照顾

加油站夜间存放的现金必须符合（）制定的安全规定。

A.零售管理部

B.财务资产部

C.县区公司

D.加油站