IPv6地址自动配置可以分为有状态和无状态两种方式。以下描述中，正确的是______
题型：单项选择题
问题：
IPv6地址自动配置可以分为有状态和无状态两种方式。以下描述中，正确的是______。
A．无状态地址自动配置所生成的地址由64位前缀和64位EUI-64接口ID组成
B．无状态配置需要DHCPv6支持，有状态配置不需要DHCPv6支持
C．有状态地址自动配置要求本地链路支持组播，且网卡要能收发组播包
D．在默认状态下，IPv6路由器的地址是自动配置的
题型：单项选择题
第三部分：阅读理解（共15小题；每小题2分，满分 30分）
阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该项涂黑。
A
Kenya wants to organize a major international conference to discuss how to fight piracy(海盗) off the coast of Somalia. The conference may also deal with ways to rescue Somalia from seventeen years of civil war. More than forty percent of its people depend on food aid.
Kenyan Foreign Minister Moses Wetangula says the world cannot end piracy and civil war without dealing with Somalia’s political problems.
Somali pirates operate in the Indian Ocean and the Gulf of Aden. The Gulf of Aden connects the Red Sea to the Mediterranean by way of the Suez Canal. The pirates have fast boats, modern weapons and equipment like satellite phones and global positioning systems.
Pirates hijacked the Sirius Star off the coast of Kenya and moved it to waters off Somalia.
The tanker Sirius Star, at three hundred thirty meters long, is the biggest ship ever known to have been captured by pirates. It also happened farther south than most attacks, and farther out at sea ---- more than eight hundred kilometers from land.
The ship was headed for the United States with two million karrels of oil, worth an estimated one hundred million dollars. A Saudi Arabian company owns the tanker. The pirates have reportedly demanded twenty-five million dollars in negotiations to release the ship and its crew of twenty-five.
Somali pirates generally do not steal goods or kill hostages. They are believed to be holding seventeen ships with about three hundred crew members. Among the ships is a Ukrainian vessel hijacked(劫持) in September with a load of military weapons including tanks.
The increase in piracy is raising the cost of insuring ships. Also, oil from the Middle East and exports from East Asia could take longer to arrive.
Some of the world’s heaviest shipping traffic passes the Somali coast. But major shipping companies have begun to consider new routes. One of the world’s biggest shippers, A.P, Moeller Maersk, says it will avoid the Gulf of Aden. A move away from the Suez Canal could hurt Egypt’s economy.
American and other foreign navy ships are now watching for pirates. This week the Indian Navy destroyed a heavily armed “mother ship” in the Gulf of Aden. But the area to protect covers more than one hundred sixty million square kilometers.
56. According to the passage, which of the following is the key to solving the piracy in Somalia?
A. Providing lots of money. B. Ending Civil war.
C. Supplying enough food. D. Handling Somalia’s political problems.
57. Somali pirates do the following things except that _______.
A. they demand money B. they hold the ships with crew
C. they kill some of the hostages D. they hijack ships with military weapons
58. What can we infer from the passage?
A. The cost of ship transport is decreasing.
B. The routes of some ships might change.
C. Nothing has been done to fight against the piracy.
D. The Suez Canal is of no importance to Egypt’s economy.