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阅读下面的说明，回答问题1至问题4。
【说明】
某企业园区网采用了三层架构，按照需求，在网络中需要设置VLAN、快速端口、链路捆绑、Internet接入等功能。该园区网内部分VLAN和IP地址如表12-2所示。
表12-2

某交换机的配置命令如下，根据命令后面的注释，填写(1)～(3)处的空缺内容，完成配置命令。
Switch(config) (1)//将交换机命名为Sw1
Swl(config) interface vlan 1
Swl(config-if) (2) //设置交换机的IP地址为192.168.1.1/24
Swl(config-if) no shutdown
Swl(config) (3) //设置交换机默认网关地址

A.shangxueba.cn/images/ct_crmntxz_crmntxfuzae_00080(20094).jpg'
B.168.1.1/24

【参考答案】

(1)hostname sw1(2)ip address 192.168.1.1 255.255.255.0(3)ip ......

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听力原文： I've mentioned how DNA have solved many mysteries in biology. And today I want to talk about how it might relate to hypothesis about the travels of the green turtle. Every winter some green turtles make a 2000 km journey from Brazil to Ascension Island in the middle of Atlantic, where they mate and lay eggs. But the question is why do they travel so far to lay their eggs? One researcher hypothesized that there are two parts to the explanation. One is natal homing, the instinct that drives green turtles to always return to the beach where they were hatched. The second part has to do with continental drift, the theory that the positions of earth continents have changed considerably overtime. Brazil and Ascension Island were once much closer together, and continental drift drove them apart. But the turtles kept on going back to the island where they hatched. However another scientist question this explanation on the ground that it would be very unlikely that conditions would allowe generations of turtles over hundreds of millions of years to keep going back to the same nesting ground every single year. So, what is the connection to DNA? Well, there are groups of green turtles that nest in locations other than the Ascension Island. If green turtles always return to the place where they were hatched, then the turtles that have been going to the Ascension Island to nest would've been genetically isolated long enough to have DNA that was very different from the green turtles that nest else where. But when scientists examine DNA from these turtles, their DNA wasn't that different from the DNA of the turtles that go to Ascension Island. Do you have a shock? Well, we still don't know the answer to the question about why a certain group of turtles go to Ascension Island, but this study was a nice example of the usefulness of DNA analysis to biology.(44)A．A possible explanation for why green turtles nest in certain locations.B．Physical differences among various groups of green turtles.C．Several examples of mating behavior. in green turtles.D．The impact of continental drift on the diet of green turtles.