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问题 解答题

某商场举行“庆元旦，送惊喜”抽奖活动，10 000个奖券中设有中奖奖券200个．

（1）小红第一个参与抽奖且抽取一张奖券，她中奖的概率有多大？

（2）元旦当天在商场购物的人中，估计有2000人次参与抽奖，商场当天准备多少个奖品较合适？

答案

（1）根据题意分析可得：10000个奖券中设有中奖奖券200个；

故小红中奖的概率=

200
10000
=
1
50
；（3分）

（2）估计有2000人次参与抽奖，每个人中奖的概率都是

1
50
，故有
1
50
×2000=40，因此商场当天准备奖品40个比较合适．（6分）

单项选择题

计算机中数据传送有2种方式，即并行和串行方式，其中并行口的信息传送方式是( )。

A．依次两位接两位传送

B．同时整个字长传送

C．依次一位接一位传送

D．以上方式都可以
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单项选择题

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.

According to the passage, efficiency of e-mail is threatened by ______.

A．heavy e-mail traffic

B．fraudulent e-mail messages

C．large volume of messages

D．increasing amount of unwanted e-mail
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