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计算并填写下表IP地址117.201.58.42子网掩码255.240.0.0地址类别(41) 网络地址(42) 直接广播地址(43) 受限广播地址(44) 子网内最后一个可用IP地址(45) 42（）

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Gun Rights in the US Immediately after the shooting at Virginia Tech University, Americans gathered to mourn (致哀) the dead. The president and the state governor both hurried there to share the (51) . But the majority of Americans still cling to their right to (52) weapons. Strictly speaking, the US is not the only country (53) gun violence has destroyed lives, families and communities in everyday circumstance. But the US is one of the (54) countries that seem unwilling and politically incapable of doing anything serious to stop it. In countries like Britain and Canada, the government adopted stricter (55) control soon after serious gun violence incidents. US leaders, however, are held (56) by the gun lobby (院外活动集团) and the electoral (选举) system. The powerful National Rifle Association, the major supporter of gun (57) in the US, is too strong for any party to take on. Most Republicans oppose gun control anyway. (58) the years, the Democrats have found that they can either campaign for gun control or win power, not (59) ;they prefer power. A. rocket B. knife C. gun D. bullet

According to the US Bureau of Justice Statistics, firearm (火器) incidents accounted (60) nine percent of the 4.7 million violent crimes in 2005. So, although opinion polls show most Americans want stricter gun laws, many don’t want to give up their arms they (61) to protect themselves.
B. Dave Hancock, a Virginia gun lover, is one example. In an interview he said, "If one professor in the Virginia incident had been carrying a legal weapon, they might have been able to (62) ai1 this." In his opinion, the massacre (大屠杀) is an argument for more people to carry weapons, not fewer.
C. But at the root of Americans’ clinging to the right to bear arms is not just a fear of crime, but a mistrust of (63) ,commented UK’s Guardian newspaper.
D. One Virginia resident, who had a permit to carry a concealed (隐藏的) firearm, told the Guardian that it was (64) American’s responsibility to have a gun.
E. "Each person," he said, "should not rely solely (65) the government for protection.\

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为了保障内部网络安全，某公司在Internet的连接处安装了PIX防火墙，其网络结构如图12-6所示。完成下列命令行，对网络接口进行地址初始化配置：Firewall(config)#ip address ins.ide (51) (52) Firewall(config)#ip address outside (53) (54) 阅读以下防火墙配置命令，为命令选择正确的解释。Firewall(config)#global(outside)1 61.144.51.46 (55) Firewall(config)#nat(inside)1 0.0.0.0 0.0.0.0Firewall(config)#static(inside,outside) 192.168.0.1 61.144.51.42 51（）

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Questions 19-27Complete the summary below by using words taken from Reading Passage 2.Use NO MORE THAN THREE WORDS OR A NUMBER for each answer. Write your answers in boxes 19-27 on your Answer Sheet.Initially, doctors believed that Valium was a comparatively (19) drug for a number of reasons: it worked quickly, patients could take it but give it up easily and it didn’t create any unpleasant (20) However, about thirty years ago some disturbing facts became apparent. Doctors found that Valium was (21) in the short term and users needed to (22) the dosage in order to get the same effect. They also found that even users who took a (23) dose became addicted very quickly. In addition to this, one of the most worrying concerns about Valium use was that it was extremely (24) for users to give up the drug because it had a long half-life. Doctors are now aware that patients who take Valium merely receive a short-lived feeling of (25) .Therefore, guidelines have been developed to make sure that it is used only when it is (26) More caution needs to be exercised. Doctors need to talk about patients’ stress levels and advise them of (27) . Finally, patients need to be more aware of the medications they take. 26（）

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Questions 11 to 18 are based on the conversation yon have just heard.

A. To the dentist’s.
B. To the market.
C. To the post office.
D. To the bookstore.

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