题目内容
（请给出正确答案）
A、the selling concept
B、the marketing concept
C、the product concept
D、the production concept
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II. Concepts: B1-7 (5 points each, 35 points in total) B1. What is the main task of the internet layer in the TCP/IP reference model respectively？ What kind of protocol performs that task？ B2. Please explain the differences between switches and routers. Hint you: Which layer do they work at？ What kind of address do they forward data based on？ B3. Why we need media access control？ Please list two or more media access control methods. B4. What is the exposed station problem？ Please sketch a graph to explain if necessary. B5. Besides flooding, what other routing algorithms have you learned？ B6. Transport layer uses both flow control and congestion control. Please tell us what flow control is and what congestion control is？ B7. What is the main difference between TCP and UDP？
It is traditional when dealing with languages of all sorts to try to separate concerns with(1), the subject of syntax, from concerns with(2), the field of semantics. Consider the simple "language" of binary numerals. Some examples of binary numerals are
1
101 101
11001 101111
A communication in this language evidently consists of afinite sequence of characters “0”、“1". This is just syntax however, and says(3)about what such a communication is intended to mean.
Numbers are"(4)" mathematical concepts, whereas the digit strings that appear on paper are numerals, that is to say,(5)representations or descriptions of numbers.
these possibilities. It is better__1__ we plan for these situations by finding means to deal with them than to just hope that they will somehow go away.__2__insurance can be complex, its basic concepts are neither difficult __3__ impossible to learn. Quite the opposite. Insurance fundamentals can be understood by those willing __4__ them. Serious study provides knowledge. The study of insurance is an effective, proven method of dealing with the insurance __5__ by many American families.
1.（ ）；
2.（ ）；
3.（ ）；
4.（ ）；
5.（ ）；
1
A、for
B、when
C、that
D、which
2
A、Because
B、As
C、Since
D、Although
3
A、no
B、nor
C、neither
D、not
4
A、studying
B、of studying
C、to study
D、studied
5
A、faced
B、that faced
C、facing
D、to face
选出应填入下面一段英语中______内的正确答案。
With hundreds of rrullions of electronic(1)taking place daily, businesses and organizations have a strong incentive to protect the(2)of the data exchanged in this manner, and to positively ensure the(3)of those involved in the transactions. This has led to an industry-wide quest for better, more secure methods for controlling IT operations, and for deploying strong security mechanisms deeply and broadly throughout networked infrastructures and client devices. One of the more successful concepts to engage the imaginations of the security community has been the development of standards-based security(4)that can be incorporated in the hardware design of client computers. The principle of encapsulating core security capabilities in(5)and integrating security provisions at the deepest levels of the machine operation has significant benefits for both users and those responsible for securing IT operations.
A．Y
B．N
C．NG
Which of the following is NOT discussed in the passage？
A．Their concepts of domestic space.
B．Their social relationships.
C．The functions of their rooms.
D．The layout of their houses.
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