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Which two benefits are provided by using a hierarchical addressing network addressing scheme?（）
A . reduces routing table entries
B . auto-negotiation of media rates
C . efficient utilization of MAC addresses
D . dedicated communications between devices
E . ease of management and trouble shooting
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Two well-developed high pressure areas may be separated by a（）.
A . Hill of low pressure
B . Trough of low pressure
C . Valley of low pressure
D . Ridge of low pressure
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The connection between two networks from an intemet is handled by a machine known as a（）
A . bridge
B . server
C . router
D . switch
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The ship（）on a low rock was broken in two by the waves.
A . that had been driven
B . had been driven
C . have been driven
D . which to have been drive
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Which two values are used by Spanning Tree Protocol to elect a root bridge (Choose two.)（）。
A . amount of RAM
B . bridge priority
C . IOS version
D . IP address
E . MAC address
F . speed of the link
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A vessel in distress should send by radio telephone the two tone alarm signal followed immediately by the（）.
A . distress position
B . spoken words "Mayday，Mayday，Mayday"
C . ship's name
D . ship's call letter
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Which two values are used by Spanning Tree Protocol to elect a root bridge? (Choose two.)（）。
A . amount of RAM
B . bridge priority
C . IOS version
D . IP address
E . MAC address
F . speed of the link
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You work as a network engineer for . You study the switch exhibit carefully.
Which two statements are true？ （）
Exhibit:
https://assets.asklib.com/images/image2/2018073016342661542.jpg
A . The trust boundary is not on this switch.
B . It is displaying the AutoQos configuration that was initially applied.
C . Interface Fa0/3 trusts allCoS values.
D . The switch does not trust theCoS values of a Cisco IP phone attached to port Fa0/3.
E . The show auto qos command shows the user-defined QoS settings.
F . The show auto qos command does not display user configuration changes currently in effect.
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A line of position formed by sighting two charted objects in line is called a(n)（）.
A . relative bearing
B . range line
C . track line
D . estimated positio
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\Of Studies\ is one of the most popular essays by Francis Bacon. In this essay, Bacon uses a great deal of _______.
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Bionics is a study in search of principle applicable to engineering by studying of living creatures.
A．Y
B．N
C．NG
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The two countries were separated by a c .
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______ is a branch of linguistics which studies the internal structure of words and the rules by which words are formed.
A．Syntax
B．Grammar
C．Morphology
D．Morpheme
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Translating Jiang Shan talked LI NA into returning to the sport two years after Li had dropped out to study at a university.
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By studying business, you can become （) and investor and be a better employee.
A. more informed a consumer
B. a more informing consumers
C. a more informed consumer
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英语完形填空 Two sister were digging a hole behind their house when some older boys stopped by to
英语完形填空 Two sister were digging a hole behind their house when some older boys stopped by to watch
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Based on recent studies made by various scholars， which of the following factors plays a fundamental role in man‘s longevity？ 查看材料
A.Genes.
B.Eating habits.
C.Environment.
D.Medical condition.
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The longest bull run in a century of art-market history ended on a dramatic note with a sale of 56 works by Damien Hirst, Beautiful Inside My Head Forever, at Sotheby's in London on September 15th, 2008．All but two pieces sold, fetching more than ￡ 70m, a record for a sale by a single artist. It was a last victory. As the auctioneer called out bids, in New York one of the oldest banks on Wall Street, Lehman Brother, filed for bankruptcy.
The world art market had already been losing momentum for a while after rising bewilderingly since 2003．At its peak in 2007 it was worth some $ 65 billion, reckons Clare McAndrew, founder of art Economics, a research firm-double the figure five year earlier. Since then it may have come down to $ 50 billion. But the market generates interest far beyond its size because it brings together great wealth, enormous egos, greed, passion and controversy in a way matched by few other industries.
In the weeks and months that followed Mr Hirst's sale, spending of any sort became deeply unfashionable. In the art world that meant collectors stayed away from galleries and salerooms. Sales of contemporary art fell by two-thirds, and in the most overheated sector, they were down by nearly 90% in the year to November 2008．Within weeks the world's two biggest auction houses, Sotheby's and Christie's, had to pay out nearly $ 200m in guarantees to clients who had placed works for sale with them.
The current downturn in the art market is the worst since the Japanese stopped buying Impressionist at the end of 1989．This time experts reckon that prices are about 40% down on their peak on average, though some have been far more fluctuant. But Edward Dolman, Christie's chief executive, says: "I'm pretty confident we're at the bottom. "
What makes this slump different from the last, he says, is that there are still buyers in the market. Almost everyone who was interviewed for this special report said that the biggest problem at the moment is not a lack of demand but a lack of good work to sell. The three Ds--death, debt and divorce-still deliver works of art to the market. But anyone who does not have to sell is keeping away, waiting for confidence to return.
In the first paragraph, Damien Hirst's sale was referred to as "a last victory" because______.
A．the art marker had witnessed a succession of victories
B．the auctioneer finally got the two pieces at the highest bids
C．Beautiful inside My Head Forever won over all masterpieces
D．it was successfully made just before the world financial crisis
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听力原文：Recently a five-year study was conducted by the Center for Childhood Development
听力原文： Recently a five-year study was conducted by the Center for Childhood Development in Los Angeles, California regarding the way babies react to different types of people. The findings of the study suggest that infant children seem to be more comfortable around other babies than they are with strange adults.
The result confirm the ideas of Dr. Richard Perelman, a well-know pediatrician, who has written many books about raising children. Dr. Richard Perelman supports the findings of the study and adds that it is a sounder idea to keep children with other children, as in a day care center, than it is to have children cared for by a baby-sitter.
According to the results of the study, infants benefit from being in the company of other babies on a daily basis. Whereas some babies seem to show fear of strange adults. They are likely to reach out to try to touch an unfamiliar baby. The study even suggests that children as young as one year old can form. friendships
According to the study, what is the way the babies react to different people？
A．They seem to be more comfortable around other babies than with strange adults.
B．They seem to be more nervous around other babies than with strange adults.
C．They seem to be as comfortable around other babies as with strange adults.
D．They have no special interest.
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The longest bull run in a century of art-market history ended on a dramatic note with a sale of 56 works by Damien Hirst, Beautiful Inside My Head Forever, at Sotheby's in London on September 15th 2008. All but two pieces sold, fetching more than ￡70m, a record for a sale by a single artist. It was a last victory. As the auctioneer called out bids, in New York one of the oldest banks on Wall Street, Lehman Brothers, filed for bankruptcy.
The world art market had already been losing momentum for a while after rising bewilderingly since 2003. At its peak in 2007 it was worth some $65 billion, reckons Clare McAndrew, founder of Arts Economics , a research firm—double the figure five years earlier. Since then it may have come down to $50 billion. But the market generates interest far beyond its size because it brings together great wealth, enormous egos, greed, passion and controversy in a way matched by few other industries.
In the weeks and months that followed Mr Hirst's sale, spending of any sort became deeply unfashionable. In the art world that meant collectors stayed away from galleries and salerooms. Sales of contemporary art fell by two-thirds, and in the most overheated sector, they were down by nearly 90% in the year to November 2008. Within weeks the world's two biggest auction houses, Sotheby's and Christie's, had to pay out nearly $200m in guarantees to clients who had placed works for sale with them.
The current downturn in the art market is the worst since the Japanese stopped buying Impressionists at the end of 1989. This time experts reckon that prices are about 40% down on their peak on average, though some have been far more fluctuant. But Edward Dolman, Christie's chief executive, says: " I'm pretty confident we're at the bottom. "
What makes this slump different from the last, he says, is that there are still buyers in the market. Almost everyone who was interviewed for this special report said that the biggest problem at the moment is not a lack of demand but a lack of good work to sell. The three Ds—death, debt and divorce—still deliver works of art to the market. But anyone who does not have to sell is keeping away, waiting for confidence to return.
In the first paragraph, Damien Hirst's sale was referred to as "a last victory" because_________.
A．the art market had witnessed a succession of victories
B．the auctioneer finally got the two pieces at the highest bids
C．Beautiful Inside My Head Forever won over all masterpieces
D．it was successfully made just before the world financial crisis
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Scientists have long believed one way to stop the Earth’s atmosphere from warming is by planting more trees. The idea is that more trees will take in or absorb some of the carbon dioxide in the atmosphere. Carbon dioxide is a gas released by cars, factories and other human activities. The gas traps heat in the Earth’s atmosphere, which warms the planet. However, two new studies have found that trees may not be as helpful in reducing carbon dioxide as had been thought.
The first study was done at Duke University in Durham, North Carolina. Researchers pumped extra carbon dioxide into a test area where pine trees were growing. The trees grew thirty-four percent faster during the first three years. However, in time, the trees slowed to about their normal growth rate. The scientists say this is because trees need other nutrients, such as nitrogen.
In the second study, researchers from Duke and Bowdoin College in Brunswick, Maine examined the soil around trees. They discovered that as the leaves broke down into the soil, all the carbon was not trapped in the soil. Much of it was released into the atmosphere as carbon dioxide.
The findings of the two studies were published last month in Nature magazine. They suggest there is limited value in planting trees to reduce the carbon dioxide pollution in the atmosphere.
Forest planting has been a part of negotiations on a world agreement to reduce greenhouse gases that scientists believe cause global warming. The United States, Canada, Japan and some other industrial countries have supported the idea. But this new research suggests the idea is not as effective as environmental activists had thought. Scientist Ram Oren of Duke University led the study on tree growth. He says that earlier estimates on the ability of forests to absorb carbon dioxide were overly hopeful.
Some scientists not involved in the studies say the research provides some of the first evidence on how trees react to carbon dioxide. Other scientists say the research disputes a belief among some coal and power companies. The companies say that rising levels of carbon dioxide in the atmosphere will not create harmful global warming. Instead, they say it will increase forests and other plants.
What is the purpose of this passage？
A．Introduce some new ideas about the relationship between trees and carbon dioxide.
B．Introduce recent condition of global industrial pollution.
C．Call on people to plant more trees to reduce greenhouse gases.
D．Point out that power companies should be responsible for the rising levels of carbon dioxide.
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Jiang Shan talked Li Na into returing to the sport two years after Li had dropped （） to study at a university.
A．in
B．on
C．out
D．of
