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How does a DHCP server dynamically assign IP addresses to hosts?（）
A . Addresses are permanently assigned so that the host uses the same address at all times.
B . Addresses are assigned for a fixed period of time. At the end of the period, a new request for an address must be made, and another address is then assigned.
C . Addresses are leased to hosts. A host will usually keep the same address by periodically contacting the DHCP server to renew the lease.
D . Addresses are allocated after a negotiation between the server and the host to determine the length of the agreement.
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How does a switch respond when it receives a message?（）
A . It reads the Layer-5 information and sends the message directly to the intended computer.
B . It reads the Media Access Control (MAC) address and broadcasts the message to all the computers that are connected to the switch.
C . It reads the Media Access Control (MAC) address and sends the message directly to the intended computer.
D . It reads the Layer-5 information and broadcasts the message to all the computers that are connected to the switch.
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How does a coast radio station communicating by HF radio normally identify itself?（）
A . By its subscriber number
B . By its call sign
C . By its MMSI
D . By its MID
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A:How long does the remittance take from New York? B:（）
A . I'm not sure. It depends on the mode your partner chose
B . I'm not sure about that. It is a big city
C . I don't know for sure. It is quite busy now in our bank
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How does the author make his arguments convincing to his readers?
A . He cites noted authorities as a means of supporting his opinions
B . He presents a thesis and then lists evidence to supporting his opinions
C . He summarized an official document and then discusses it in detail
D . He uses official documents and then gives his personal interpretation
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How many steps are there when we make a presentation according to the video?
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How does the wrong career lead to a midlife crisis?
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What did N ot Kevin Hanley 1990 see in his dream?
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How many whales does Japan kill a year and what does it say is the purpose?
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____Being bright does not necessarily make one a straight-A student.
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Why does Kevin 1990 decide to study instead of going shopping?
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It is important to know how to make a proper introduction.
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How much does a manicure and a pedicure cost if purchased without a special discount?
A、$ 100
B、$ 200
C、$ 120
D、$ 140
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How does music affect Kevin?
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How much does a pedicure cost according to the passage?
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How many ingredients does Henry need at least to make feuit smoothie?意思
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Why does Rose have to make a phone call？
A．To order furniture
B．To ask the address of the warehouse
C．To complete a shipping order
D．To ask the e-mail address
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What point does the professor make when he mentions a ships path？
A．It is easy for people to lose sight of their true path.
B．Most people are not capable of deciding which path is best for them.
C．The path a person takes can only be seen clearly after the destination has been reached.
D．A person should establish a goal before deciding which path to take.
此题为多项选择题。
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How does the article suggest the matter that makes up the Earth was first spread through the universe？
A．Through expulsion from black holes.
B．Through the explosions of stars.
C．Hydrogen propulsion.
D．Theoretical balancing.
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How did Books-A-Million make its profit increase ten times？
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A man wants to make a reservation from Hong Kong, how would you like to do ?
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How much living space does a person need？ What hap...
How much living space does a person need？ What happens when his space requirements are not adequately met？ Sociologists and psychologists are conducting experiments on rats to try to determine the effect of overcrowded conditions on man. Recent studies have shown that the behavior. of rats is greatly affected by space. If rats have adequate living space, they eat well, sleep well, and reproduce well.
However, if their living conditions become too crowded, their behavior. patterns and even their health perceptibly change. They cannot sleep or eat well, and signs of fear and tension become obvious. The more crowded they are, the more they tend to bite each other and even kill each other. Thus for rats, population and violence are directly related. Is this a natural law for human society as well？ Is adequate space not only desirable, but also essential for human survival？
This passage is mainly about ______.
A.living space and behavior
B.population and living conditions
C.interesting experiments on rats
D.a natural law for human society
What is the purpose of the experiments described in the passage？A.To determine how much living space a rat needs.
B.To see what happens when rats live in a limited space.
C.To know the likely effects of inadequate living space on human beings.
D.To find out the relationship between population and living conditions.
How would rats behave when their living conditions become too crowded？A.They eat a lot and become friendly to others.
B.They sleep little and act quite peacefully.
C.They eat little but sleep soundly.
D.They become nervous and tend to be war-like.
The passage suggests that overcrowded conditions ______.A.are directly related with population
B.may cause an increase in violence
C.may lead to high birth rate
D.may bring about pollution problems
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In the film About a Boy, what does Will do to make a living（)？A.He writes songs
B.He sells CDs and trainers
C.He organizes activities in SPAT
D.He lives off the royalties on his father’s song and never work
