问题 单项选择题

互联网上的一台主机如果使用C类地址202.93.120.255作为数据报的目的IP地址,那么这个数据报将同时发送到______网络上的所有主机。

A.202.93.120.0

B.202.93.120.0

C.202.0.0.0

D.202.93.0.0

答案

参考答案:A

解析:[知识点] 特殊的IP地址形式
[评析] 如果广播地址包含一个有效的网络号和一个全“1”的主机号,那么技术上称之为直接广播地址。在IP互联网中,任意一台主机均可向其他网络进行直接广播。本题中C类地址202.93.120.255就是一个直接广播地址。互联网上的一台主机如果使用该IP地址作为数据报的目的p地址,那么这个数据报将同时发送到 202.93.120.0网络上的所有主机。

阅读理解

For kids and many adults, a San Diego vacation means theme parks and other attractions. Before heading to a park, call or check its website for updated hours of operation; many parks have seasonal or holiday hours. Ticket prices listed here are for general admission, single-day use only.

Sea World San Diego

A 6-minute ride called Journey to Atlantis, which is to open in late May, tells the legend of the island nation. After the ride of Greek fishing boats, folks can visit a new exhibit of dolphins, which have not been on display at the park since 1998.

DETAILS: General admission is $46.95 for adults, $37.95 for children aged 3-9, free for children 2 and younger. 1-800-380-3230 or www.seaworld.

San Diego Zoo

There’s not much in the way of new attractions. The zoo has a baby panda, Mei Sheng. Nighttime Zoo, a program popular with families, starts June 26.

DETAILS: General admission is $21 for adults, $14 for children aged 3-11, free for children 2 and younger. 1-(619)-234-3153 or  www.sandiegozoo,org.

Maritime (海的) Museum of San Diego

The HMS Surprise, the 18th-century British warship featured in the film Master and Commander, is on exhibit through Nov. 30.

DETAILS: The ship is in use for tours from 9 am to 8 pm daily. Admission is $8 for adults, $6 for seniors and children aged 13-17, $5 for kids aged 6-12, and free for kids 5 and younger. 1-(619)-234-9153 or www.sdmaritime.org.

Old Town Trolley Tours

Visiting relatives or friends in San Diego? They can get a hometown pass and ride for free with your paid admission.

DETAILS: The main ticket booth (售票厅) is in Old Town at 4010 Twiggs. Hours are from 9 am to 5 pm, daily $25. www.historictours/sandiego.

小题1:The purpose of this passage is to _____.

A.warn

B.amuse

C.persuade

D.guide小题2:If you want to enjoy the performance of dolphins, you should go to _____.

A.Sea World San Diego

B.San Diego Zoo

C.Maritime Museum of San Diego

D.Old Town Trolley Tours小题3:If a couple visits San Diego Zoo with their children, one aged 3 and the other 2, the admission will be _____.

A.$ 35

B.$ 49

C.$ 56

D.$ 70

选择题