若把a千克盐溶入b千克水中，得到盐水，则x千克这种盐水溶液含盐量是（ ）千克。

The first big-name hackers include Steve Wozniak, Bill Gates and Linus Torvalds, all now highly recognizable names behind many of the computer technologies used today. These early hackers had a love of technology and a compelling need to know how it all worked, and their goal was to push programs beyond what they were designed to do. Back then, the word "hacker" didn’t have the negative connotation it has today. The original hacker ethic, rooted out of simple curiosity and a need to be challenged, appears to be dead.

The objectives of early hackers are a far cry from the goals of today’s hacker. The motivation of the new breed of hackers appears not to be curiosity, or a hunger for knowledge, as it used to be. Instead, most of today’s hackers are driven by greed, power, revenge, or some other malicious intent, treating hacking as a game or sport, employing the tools that are readily available via the Internet.

The rate of security attacks is actually outpacing the growth of the Internet. This means that something besides the growth of the Internet is driving the rise in security attacks. Here are some realities you should know about: Operating systems and applications will never be secure. New vulnerabilities will be introduced into your environment every day. And even if you ever do get one operating system secure, there will be new operating systems with new vulnerabilities—phones, wireless devices, and network appliances. Employees will never keep up with security polices and awareness. It doesn’t matter how much you train and educate your employees. If your employees disregard warnings about the hazards of opening questionable email attachments, how are you going to educate them about properly configuring firewalls and intrusion detection systems for their PCs Managers have more responsibility than ever. And on top of the realities listed above, security managers are being asked to support increasing degrees of network availability and access.

There are some good security measures you can take: Employ a layer 7, full-inspection firewall. Automatically update your anti-virus at the gateway, server and client. Keep all of your systems and applications updated. Hackers commonly break into a Web site through known security holes, so make sure your servers and applications are patched and up to date. Turn off unnecessary network services. Eliminate all unneeded programs. Scan network for common backdoor services--Use intrusion detection systems, vulnerability scans, anti virus protection.

Various security measures are recommended EXCEPT（）

A. turning off network services

B. employing a full-inspection firewall

C. making sure that servers and applications are patched

D. eliminating all unneeded programs

_________的生活集体是由血缘关系结合在一起的氏族。[ ]

A、北京人

B、元谋人

C、山顶洞人

D、蓝田人

子宫颈癌直接蔓延途径中最为常见的是

A．沿子宫下端肌壁间向上蔓延

B．沿 * * 黏膜向下蔓延

C．沿宫旁两侧向盆壁蔓延

D．沿宫颈前方向膀胱蔓延

E．沿宫颈后方向直肠蔓延

根据汉语意思完成句子

1.他对她痛苦的遭遇感到同情.

    He                          her sufferings.

2. 海员们举行罢工,以表示对码头工人的支持.

    The seamen went on strike                        the dockers.

3.我不同情简,那是她自己的错；

    I       ____                  Jane．It's all her own fault.

关于急性型特发性血小板减少性紫癜，正确的是（）

A.青年女性常见

B.病前1～3周常有服药史

C.出血往往较轻

D.病程有自限性

E.常见脑出血死亡