What are two design guidelines for VoIP networks？ （）

A. facilitates customer deployments that are less reliable

B. facilitates customer deployments that are more predictable

C. separates products and technologies into individual portfolios

D. incorporates products and technologies into a broad portfolio

E. strives to protect access to design documentation

tionship between subject (“I”) and object (natural elements), humanity and nature？

A.Two perfect anapestic octameter lines.

B.Two perfect trochaic hexameter lines.

C.Two perfect iambic tetrameter lines.

D.Two perfect iambic pentameter lines.

A. Each module uses application-specific integrated circuits (ASICs).

B. Each module runs in its own protected memory space.

C. Each module can be individually restarted.

D. Each module is supported across all Junos platforms.

A. The design supports multiple server subnets.

B. An end-user sees the IP address of the real server.

C. SLB routes between the outside and inside subnets.

D. The source or destination MAC address is rewritten, but the IP addresses left alone.

E. SLB acts as a "bump in the wire" between servers and upstream firewall or Layer 3 devices.

e OSI model. Why does the data communication industry use the layered OSI reference model？ (Choose two)

A．It enables equipment from different vendors to use the same electronic components, thus saving research and development funds

B．It encourages industry standardization by defining what functions occur at each layer of the model

C．It divides the network communication process into smaller and simpler components; thus aiding component development, design and troubleshooting

D．It provides a means by which changes in functionality in one layer require changes in other layers

E．It supports the evolution of multiple competing standards and thus provides business opportunities for equipment manufacturers

阅读材料，回答题。

"High tech" and "state of the art" are two expressions that describe the modem technology. High tech is just a shorter way of saying high technology. And high technology describes any invention, system of device that uses the newest ideas or discoveries of science and engineering. What is high tech？ A computer is high tech. So is a communications satellite. A modem manufacturing (生产) system is surely high tech. High tech became a popular expression in the United States during the early 1955’s. Because of improvements in technology, people could buy many new kinds of products in American stores, such as home computers, microwave ovens, etc.

"State of the art" is something that is as modem as possible. It is a product that is based on the very latest methods and technology. Something that is "state of the art" is the newest possible design or product of a business or industry. A state of the art television set, for example, uses the most modem electronic design and parts. It is the best that one can buy.

"State of the art" is not a new expression. Engineers have used it for years, to describe the best and most modem way of doing something. Millions of Americans began to use the expression in the late 1970’s. The reason was the computer revolution. Every computer company claimed that its computers were "state of the art".

Computer technology changed so fast that a state of the art computer today might be old tomorrow. The expression "state of the art" became as common and popular as computers themselves. Now all kinds of products are said to be "state of the art".

What is the purpose of the passage？________ 查看材料

A.To tell how "high tech" and "state of the art" have developed.

B.To give examples of "high tech".

C.To tell what "high tech" and "state of the art " are.

D.To describe very modem technology.

Passage Two

In spring, chickens start laying again, bringing a welcome source of protein at winter’s end. So it’s no surprise that cultures around the world celebrate spring by honoring the egg.

Some traditions are simple, like the red eggs that get baked into Greek Easter breads.Others elevate the egg into a fancy art, like the heavily jewel-covered “eggs” that were favored by the Russians starting in the 19th century.

One ancient form. of egg art comes to us from Ukraine. For centuries, Ukrainians have been drawing complicated patterns on eggs. Contemporary artists have followed this tradition to create eggs that speak to the anxieties of our age: Life is precious, and delicate. Eggs are, too.

“There’s something about their delicate nature that appeals to me,” says New Yorker cartoonist Roz Chast. Several years ago, she became interested in eggs and learned the traditional Ukrainian technique to draw her very modem characters. “I’ve broken eggs at every stage of the process—from the very beginning to the very, very end.”

But there’s an appeal in that vulnerability. “There’s part of this sickening horror of knowing you’re walking on the edge with this, that I kind of like, knowing that it could all fall apart at any second.” Chast’s designs, such as a worried man alone in a tiny rowboat, reflect that delicateness.

Traditional Ukrainian decorated eggs also spoke to those fears. The elaborate patterns were believed to offer protection against evil.

“There’s an ancient legend that as long as these eggs are made, evil will not prevail in the world,” says Joan Brander, a Canadian egg-painter who has been painting eggs for over 60 years, having learned the art from her Ukrainian relatives.

The tradition, dating back to 300 B.C., was later incorporated into the Christian church. The old symbols, however, still endure. A decorated egg with a bird on it, given to a young married couple, is a wish for children. A decorated egg thrown into the field would be a wish for a good harvest.

Why do people in many cultures prize the egg？

A.It is a welcome sign of the coming of spring

B.It is their major source of protein in winter

C.It can easily be made into a work of art

D.It can bring wealth and honor to them

Why have contemporary artists continued the egg art tradition？A.Eggs serve as an enduring symbol of new life

B.Eggs have an oval shape appealing to artists

C.Eggs reflect the anxieties of people today

D.Eggs provide a unique surface to paint on

What do we learn about the decorated “eggs” in Russia？A.They are shaped like jewel cases

B.They are cherished by the rich

C.They are heavily painted in red

D.They are favored as a form of art

Why does Chast enjoy the process of decorating eggs？A.She never knows if the egg will break before the design is completed

B.She can add multiple details to the design to communicate her idea

C.She always derives great pleasure from designing something new

D.She is never sure what the final design will look like until the end

What do we learn from the passage about egg-painting？A.It originated in the eastern part of Europe

B.It has a history of over two thousand years

C.It is the most time-honored form of fancy art

D.It is especially favored as a church decoration

请帮忙给出每个问题的正确答案和分析，谢谢！

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