问题 单项选择题

关于因特网中的电子邮件,以下哪种说法是错误的______。

A.电子邮件应用程序的主要功能是创建、发送、接收和管理邮件

B.电子邮件应用程序通常使用 SMTP 接收邮件、POP3 发送邮件

C.电子邮件由邮件头和邮件体两部分组成

D.利用电子邮件可以传送多媒体信息

答案

参考答案:B

解析:电子邮件应用程序应具有的两项最为基本的功能是:1、创建和发送邮件功能;2、接收、阅读和管 理邮件功能。电子邮件由两部分组成:邮件头和邮件体。传统的电子邮件系统只能传递西文文本信息,而目前使用 的多目的因特网电子邮件扩展协议(MIME)不但可以发送各种文字和各种结构的文本信息,而且可以发 送语音、图像和视频等信息。电子邮件应用程序向邮件服务器传送邮件时使用简单邮件传输协议(SMTP),而从邮件服务器的邮箱 中读取时使用POP3协议或IMAP协议。因此选项B说法不正确。

选择题
单项选择题

Drug use is rising dramatically among the nation’s youth after a decade of decline. From 1993 to 1994, marijuana use among young people (1) from 12 to 17 jumped 50 percent. One in five high school seniors (2) marijuana daily. Monitoring the Future, which (3) student drug use annually, reports that negative attitudes about drugs have declined for the fourth year in a row. (4) young people see great risk in using drugs. Mood-altering pharmaceutical drugs are (5) new popularity among young people. Ritalin, (6) as a diet pill in the 1970s and now used to (7) hyperactive children, has become a (8) drug on college campuses. A central nervous system (9) , Ritalin can cause strokes, hypertension, and seizures. Rohypnol, produced in Europe as a (10) tranquilizer, lowers inhibitions and suppresses short-term memory, which has led to some women being raped by men they are going out with. (11) taken with alcohol, its effects are greatly (12) . Rock singer Kurt Cobain collapsed from an (13) of Rohypnol and champagne a month before he committed (14) in 1994. In Florida and Texas, Rohypnol has become widely abused among teens, who see the drug as a less expensive (15) for marijuana and LSD. Alcohol and tobacco use is increasing among teenagers, (16) younger adolescents. Each year, more than one million teens become regular smokers, (17) they cannot legally purchase tobacco. By 12th grade, one in three students smokes. In 1995, one in five 14-year-olds reported smoking regularly, a 33 percent jump (18) 1991. Drinking among 14-year-olds climbed 50 percent from 1992 to 1994, and all teens reported substantial increases in (19) drinking. In 1995, one in five 10th graders reported having been drunk in the past 30 days. Two-thirds of high school seniors say they know a (20) with a drinking problem.

3()

A.studies

B.researches

C.surveys

D.examines