【推荐1】Over 2,000 years ago, Baiae was the most magnificent resort town in Italy. Wealthy statesmen including Cicero and Caesar were once drawn to its natural springs. But over the centuries, volcanic activity submerged this playground of the Roman nobility, leaving half of it beneath the Mediterranean.

Today, Baiae is one of the world’s few underwater archaeological parks open to visitors wanting to explore the remains of the ancient Roman city. A protected marine area, the site needs to be monitored for damage caused by divers and environmental factors. However, explains Davidde, Italy’s national supervisor for underwater cultural heritage, “Communication underwater is challenging.”

Cabled systems are the most reliable, but they are difficult to maintain and cover a limited operational area. And wireless internet doesn’t work well in water, because of the way water interacts with electromagnetic waves.

So Davidde teamed up with a group of engineers led by Chiara Petrioli, a professor at Sapienza University. Petrioli’s team has developed a network of underwater wireless sensors capable of gathering environmental data and transmitting it to land in real time. The system relies on AI algorithms (算法) to constantly change the network protocol (网络协议). As the sea conditions change, the algorithms adjust the information path, allowing the signal to travel up to two kilometers and data to be sent between transmitters one kilometer apart.

At Baiae, underwater internet allows remote, continuous monitoring of environmental conditions. Besides, it allows divers to communicate with one another and with colleagues above the surface, who can also use the technology to locate them with a high degree of accuracy.

Davidde anticipates that the network will be available to tourists visiting the archaeological site in the coming months. As they swim over the ruins, visitors will use waterproof smart tablets to communicate and to view 3D reconstructions of the ruins.

“Underwater internet has made monitoring of the archaeological site simpler and more efficient,” says Davidde, “At the same time, we can offer the public a new, interactive way to explore the underwater park.”

1. What do we know about Baiae?

A．It was noted for natural springs.	B．It is a playground for sports lovers.
C．It was destroyed by human activity.	D．It is not open to adventurous visitors.

2. What is the third paragraph mainly about?

A．Applications of underwater internet.

B．Different types of underwater network.

C．Difficulties of underwater communication.

D．Conditions of the underwater environment.

3. What is the underwater network capable of doing at present?

A．Reconstructing the ruins of the underwater park.

B．Making it easier to monitor archaeological sites.

C．Bringing more visitors to submerged Roman city.

D．Only allowing divers to communicate underwater.

4. What is the purpose of this text?

A．To explain underwater communication.

B．To analyze the effect of climate change.

C．To introduce a new underwater network.

D．To attract more visitors to explore Baiae.

【推荐2】In front of a popular restaurant, a line of customers wait for taxis. And wait. Most of the cabs(taxis) are full. That’s nothing unusual in this city of 4 million people. But it’s 2:30 in the morning.
Visitors to the Olympic Games may leave disappointed if they see Athens only through the eyes of the typical tourist, who makes a beeline of the islands after the visit to the Acropolis(雅典卫城) and the unusual and attractive Plaka district. To fully appreciate and discover Athens’ many charms(魅力), do as the Greeks do: walk out into the neighborhoods, find the packed nightclubs, eat at one of the innumerable(数不清的) restaurants, or see Hollywood stars under real stars in a romantic outdoor cinema.
The Greek capital is named for the ancient goddess Athena, whose favourite animal was the owl(猫头鹰). It’s a fitting symbol for the city’s nocturnal (夜里的) nature, which often reaches its highest point in summer with a rush hour just before dawn.
As native Athenian Panos Demestiha said, Athens by day is unlivable(不宜居住的), but it’s magical at night. Athenians face up to heavy traffic block, decreasing green space, dusty streets… City officials are using the momentum(契机) of the August 13-29 Olympics to fix some of these problems and make city life more bearable.
1. To the surprise of the visitors to Athens , ____.

A．most of the cabs are often full all day long

B．the cabs are often empty

C．the cabs are almost full even at 2:30 am

D．there is no cab in the street at 2:30 am.

2. The name of Athens came from ____.

A．a goddess	B．a famous athlete
C．a kind of animal	D．a kind of plant

3. The typical visitors will often visit the following places EXCEP ____.

A．the neighborhood	B．the Plaka district
C．the Acropolis	D．famous islands

4. The underlined word “bearable” in the last paragraph can be replaced by “____”.

A．astonishing	B．forgettable
C．exciting	D．comfortable

【推荐3】Working out on an empty stomach could increase the health benefits of the activity, according to a well-timed new study of the interaction of meal timing, physical health and exercise.

The study, which involved people sitting for long and moderate cycling, suggests that whether and when we eat may affect how exercise affects us. In general, any exercise improves our health. But a wealth of recent science and personal experience indicate that different people can respond to similar exercise routines in different ways. Even if everyone completes the same amount of exercise, some people become more fit than others, or lose more weight, or gain greater control of their blood sugar.

Most exercise scientists believe that our genes, diets, figures, characters and other subtle aspects of our lives act together to shape how our bodies react to exercise. But some researchers suspect that meal timing matters as well. Working muscles need fuel during exercise, mostly in the form of sugar or fat. That fuel can come from our most recent meal, once its constitution sugars and fats reach our bloodstreams, or from our bodies’ stores of fats and sugars.

We all have such stores, especially of fat, some of it staying in our muscles and they are well and evenly matched. This muscle fat becomes problematic if we accumulate too much of it. Fatty muscles do not respond well to the hormone insulin (胰岛素), which directs sugar from the blood into the muscles. As a result, excess fat can contribute to insulin resistance, high blood sugar levels and increased risks for Type 2 diabetes and other metabolic (新陈代谢的) conditions.

1. What do recent science and personal experience indicate?

A．Any exercise improves our health.

B．Different people react differently to similar exercise.

C．Meal timing has an effect on the result of exercising.

D．People sitting for a long time always enjoy the benefit of riding.

2. Which can best replace the underlined word “constitution” in Paragraph 3?

A．Fuel.

B．Meal.

C．Component.

D．Muscle.

3. What can we infer from the last paragraph?

A．Store of fat isn’t averagely spread in muscles.

B．Fat directs sugar from the blood into muscles.

C．Too much fat will finally lead to health problems.

D．Hormone insulin will contribute to risky conditions.

4. What is the text mainly about?

A．Exercising with empty stomach benefits people.

B．Fat and sugar will provide people with enough fuel.

C．The accumulation of muscle fat can’t be good enough.

D．Many unnoticeable aspects act together to influence exercise.

【推荐2】Taj Mahal, Agra, India
As many as 28 different varieties of precious stones were used to decorate the outside of the Taj Mahal. Construction took around 20 years. The building, which was made from white marble from the quarries(采石场) of Rajasthan, appears pink in the morning, white in the day and golden in the moonlight.
Akashi Kaikyo Bridge, Akashi Strait, Japan
It took 10 years to construct the Akashi Kaikyo Bridge. It connects the city of Kobe, on Japan’s mainland, with Iwaya on Awaji Island. Before it opened, the only way to get between the two cities was by ferry. However, the waterway was at the mercy of severe storms and when two ferries overturned in 1955, killing 168 people, public anger convinced the government of the need for a bridge. It's the longest suspension bridge in the world, with a length of 1,991 meters.
Panama Canal, Panama
More than 4. 5 million cubic yards of concrete were used in the construction of this canal’s locks and dams. The Panama Canal is a 47-mile long waterway that connects the Atlantic and Pacific Oceans. The earth and rubble dug to make way for it was enough to bury Manhattan to a depth of four meters. A series of locks allows ships to pass through the water. Each lock door weighs 750 tons and each lock fills with 52 million gallons of water to accommodate the 15,000 ships that use the canal every year.
Grand Canyon Skywalk, Arizona
The Skywalk’s foundation is strong enough to support 71 million pounds , Located 1,219 meters above the Colorado River, the Grand Canyon's Sky Walk consists of one million pounds of steel and 83,000 pounds of glass. It was the creation of Las Vegas businessman David Jin, who approached the Hualapai Tribe with the idea of a glass walkway over the Grand Canyon in 1996. The Sky walk was assembled on site.
1. The Japanese government decided to build the Akashi Kaikyo Bridge ___________

A．in the year of 1955

B．following public opinion

C．to show its national power

D．to develop Japan’s economy

2. The Grand Canyon Skywalk is probably a real challenge for those who __________

A．are airsick

B．hate rock climbing

C．have a fear of height

D．feel ill traveling in boat

3. In which section of a book can the text probably be seen?

A．Science

B．Agriculture

C．Technology

D．Geography

【推荐3】Khotyn Fortress

Built in the 13th-14th century, it lies on the bank of the Dniester River in Khotyn, of western Ukraine. It is also in the historical northern Bessarabia region which was split in 1940 between Ukraine an Moldova. And it is near to the Old Kam'yanets Castle of Kamianets-Podilskyi, which was also used as a famous defensive structure. It is convenient to book the hotels nearby it at low prices, such as Premier Club, Reikartz Kamianets-Podilsky and so on.

Kamianets Podilski Castle

It lies in the Khmelnytsky Region, Ukraine. This architectural treasure is about 800 years old. Its architecture which unites best western and eastern traditions fits into the nature perfectly. The castle consists of minaret buildings , a town hall , an Orthodox church and a Polish Catholic church. Its beauty has been attracting tourists from all over the world for many years

Vorontsov Palace

It is an historic palace lying at the foot of the Crimean Mountains near the town of Alupka in Crimea. It is one of the oldest and largest palaces in Crimea, and one of the most popular tourist attractions on Crimea's southern coast. The construction of the palace began in the early nineteenth century, according to a project by English architect Edward Blore and it was supposed to be the palace for Prince Mikhail Semyonovich Vorontsov to spend summer.

The Residence of Bukovinian and Dalmatian Metropolitans

It was built between the years 1864-1882 according to the designs of the Czech architect Josef Hlavka. The Residence, whose buildings are now part of Chernivtsi National University, Ukraine, was declared a UNESCO World Heritage Site in 2011.

1. What can we know about Khotyn Fortress?

A．It served as defence work.

B．It is open to the public for free.

C．It is the oldest building in Ukraine.

D．It was divided into two parts in 1940.

2. Which has the shortest history?

A．The Kamianets Podilski Castle.

B．The Khotyn Fortress.

C．The Vorontsov Palace

D．The Residence of Bukovinian and Dalmatian Metropolitans.

3. From which is the text probably taken?

A．A travel magazine.

B．A science brochure.

C．A research paper on history.

D．A geography textbook.