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Some travelers may be informed about the details of their flights in this program.

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阅读以下说明，回答问题1～4，将解答填入对应栏内。
虚拟专用网是虚拟私有网络(Virtual Private Network，VPN)的简称，它是一种利用公共网络来构建的私有专用网络。对于构建VPN来说，网络隧道(Tunneling)技术是个关键技术。主要有两种类型的隧道协议：一种二层隧道协议，如PPTP、L2TP；另一种是三层隧道协议，GRE、IPsec。另外，还有第四层隧道协议，如SSL VPN。图3-1所示的是某公司的总部与其分支机构连接的示意图。
针对不同的用户要求，VPN有三种解决方案：(1)、(2)和(3)。根据这三种解决方案的特点，该方案应该采用(2)。

计算乙商场3月份应缴纳的增值税。

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&8226;Read the text below about the logistics.
&8226;In most of the lines 41-52 there is one extra word. It is either grammatically incorrect or does not fit in with the meaning of the text. Some lines, however, are correct.
&8226;If a line is correct, write CORRECT on your Answer Sheet.
&8226;If there is an extra word in the line, write the extra word in CAPITAL LETTERS on your Answer Sheet.
TO Logistics is to concerned with the movement of goods from where the goods are stored
BE to the hands of the buyer. As companies progress with their business allies to be
41 advanced supply chain management, so they accept the tenet that no single firm
42 can optimally perform. all of the functions required for procurement, manufacture,
43 and delivery. They recognize the need to build a network of response in all the
44 way to the consumers needs. These companies also accept the reality that, in the
45 future, their systems must be prepared for to service business customers and
46 consumers though both physical and cyber channels that have been
47 e-commerce enabled. In no area is this partner determination more critical
48 than logistics, where numberless process steps occur, where demands for
49 placed on manufacturers accelerate at a dizzy pace, and where supply to
50 chain competency via e-commerce can be of the difference between profit and
51 loss. As business organizations continue to chase to further improvement
52 opportunities, without the doubt, supply chain networks will only be as good as their collective logistics systems. It is through a redesign of the logistics, from supply to manufacturing and beyond, that the linkages between demand chain and supply chain can be integrated to result in an effective supply chain network.
(41)