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The Great Wall of China is one of the greatest wonders of the world. With history of more than 2,000years, some parts of the Great Wall have disappeared., it is still a very popular place of interest.

It is the (long) wall ever built, is about 8 meters high. The top is 8 meters wide and it is even (wide) at the bottom. It is made of stone and brick. People built it hand and it took a long time to finish.

No one knows (exact) when the building of the Great Wall was started. It is believed the wall was built(protect) parts of the country in the old days. It also made people live a safer life.

Today, many of the visitors go to see the Great Wall. When they stand on top of a tower and look down on this wall, they can't help (say), "Wow, that's fantastic!"

Instead of looking at nature, I checked my e-mail. Instead of paddling (划桨) an old boat, I1 my Twitter feed. Instead of reading great novels, I2 reading four newspapers each morning.

And that was the problem: I was acting3 I were still in the office. My body was on vacation but my brain wasn't.

So this year I made up my mind to try something4: getting away from the Internet. I knew it wouldn't be easy, since I'm not good at self-control. But I was determined. I started by5 the iPad to my wife, so I was6 to carry out my plan. Largely7 from e-mail, Twitter and my favorite newspaper websites, I had8 ways to connect to the world except for radio and how much radio can one listen to, really? I had no choice but to do what I had planned to do all along: read books.

This experience has had a happy ending—for now, at least. With9 and the strong support of my wife, I succeeded in my vacation10 against the Internet. I finally11 that it was me, of course, not the iPad, that was the problem.

I knew I had12 when we passed a Starbucks and my wife asked if I wanted to stop to use the Wi-Fi. "Don't need it," I said. However, as we return to post-vacation situation, a test begins: Can I continue when I'm back at work? And I don' t plan to give up my convenience13. But I hope to14 the temptation (诱惑) to check my e-mail every five minutes, which often leads to following my Twitter feed.

A vacation is supposed to help you reset your15 to become more productive(高效的). Here's hoping this one worked.

In today's digital age, protecting your privacy while using apps is important. All apps collect data as you use them. Here are some good tips to keep your personal information safe.

For starters, download apps only from the App Store, not from random websites.

Before you accept an app's terms and conditions, look at what information it's planning to collect and think twice if it's asking for too many permissions. For example, why would a gaming app need access to text messages? You may think it's inconvenient, but it's worth it.

Also, most apps don't need to know your location, but for those that do, you can choose to enable location services only when using the particular app, another smart privacy safeguard.

Don't use your main e-mail address or social media account. This way, if there is a security breach (缺口), your exposure is contained to things connected to that address.

And, of course, use a secure password. This means a long one (at least ten characters) with a mixture of letters, numbers, and special characters—and a unique password for each app. According to security experts, a good trick is to create a memorable "passphrase" by creating a series of random (任意的) words, and then replace numbers or special characters for some of the letters Go ahead and write them down—just store it in a secure location (not your wallet or phone case!).

Finally, remember that privacy is an ongoing concern. Regularly review the apps you have installed and the permissions you've granted them. Stay informed about the latest privacy threats and solutions. By taking these simple steps, you can enjoy the benefits of apps while protecting your personal data.

A. It's better to be safe than sorry.

B. How will you ever remember them all?

C. Why is it so important to protect our privacy?

D. Moreover, create strong, unique passwords for each app.

E. Because it can prevent bad software from infecting your device.

F. Following these four steps will help ensure you're not oversharing.

G. Sign up an e-mail address just for things like app permissions and e-mail newsletters.

Jeffrey Gross, the university science professor who led the research, was not trying to find the relationship between sleep and grades when he handed out smart watches to the 100 students in his chemistry class. Instead, the professor hoped the devices, which track a person's physical activity, would show a connection between exercise and academic achievement.

While Gross's data showed no relationship between these two factors, the study found something surprising. As the researchers were analyzing their data, they noticed that there was a straight-line relationship between the average amount of sleep a student got and their results in the course's 11 quizzes, three midterm tests, and the final exam.

Even more interesting, it was not enough for students to just head to bed early the night before a test. Instead, it's the sleep you get during the days when learning is happening that matters most.

The time students went to bed each night was similarly important. Those who went to bed in early hours of the morning performed poorly, even if the total sleep time was the same as a higher-performing student. "When you go to bed matters," Gross says, "If you go to bed at 10, or 12, or l at night, and sleep for seven hours, your performance is the same. But if you go to bed after 2, your performance starts to go down even if you get the same seven hours. So, quantity isn't everything."

Perhaps the most interesting was the huge impact that small differences in sleep patterns had on the students' grades. The overall course grades for students averaging six and a half hours of sleep each night were 25% lower than students who averaged just one hour more sleep. Similarly, students who varied their bedtime by even one hour each night had grades that dropped 45% below those with more regular bedtimes.

The HeRo robot that is being tested, is a project of Forum Virium, an innovative Finnish company. The trial will be running through the end of December 2023. The goal is to show how packages can be quickly delivered to people's homes with great accuracy even during the holiday season.

HeRo is not just a delivery robot, it's electric and operates without any dangerous emissions, plus it is self-navigating (导航) and talks. The delivery robot was made by the French robotics firm TwinswHeel and uses an interface created by the Finnish company LMAD. The four-wheeled vehicle can carry up to 300 kilograms and can travel up to 20 kilometers on just one charge of its lithium(锂)battery pack. HeRo uses a combination of GPS and onboard sensors(传感器)to run through the city's streets.

HeRo can carry several orders at once. Each order is in a separate locker and customers can open their lockers electronically. In just one hour, the robot delivers packages from a few shops to people in the Ruoholahti and North Jätkäsaari areas. No other delivery service is as fast or as clean.

This isn't HeRo's first appearance on Helsinki streets. From May to August 2023, there was a first phase trial. It carried packages from Würth Center (a place that gives tools and supplies for industry) to nearby workplaces. These trials are part of the international URBANE project. The project wants to find new, green ways to make logistics better for both companies and people. Soon, there will be new trials in cities in Spain and Greece. Using self-driving robots for zero-emission delivery is an idea that should be used all over the world.

We had taken the subway all over the city and were congratulating ourselves on our understanding of what is honestly a good subway design that is pretty easy to follow. We decided to visit Versailles by train. We chatted happily along the way until my father realized we were far into the French countryside and no one around spoke English.

We reached the end of the line and felt frightened when everyone finally left the train. An old man and his grandchild noticed us and came up to help. He spoke no English, so in broken French we tried to explain. When he finally understood, this great man settled his grandson and showed us to the correct train and then got on it with us.

Later we knew the truth that there was a train transfer(换乘)and he didn't want us to miss it. This kind man rode a train an hour and a half out of his way to make sure that three Americans got where they wanted to be. He refused to let us pay for his ticket. He did it all with a gentle smile and shook our hands gently at the stop. Then with his quiet way, he got on the train to return the way he had come.

What impressed me most was the man and his kindness during the amazing trip. Some Americans think the French are rude for some reason, but I always try to make them change their minds with this story.

We offer three different tours of this amazing building.

The Essential Tour

It brings to life the story behind the design and construction of one of the world's most famous places. Using audio-visual technology, your guide will take you on a memorable journey inside the youngest building ever to be World Heritage listed. Afterwards, why not stay around and eat at the Studio Cafe, with its modern Australian menu? Not only can you enjoy the best views in Sydney, but also you can claim a 20% reduction on the total cost of your meal.

Takes place: Daily between 9 am and 5 pm

Prices: Adults $35/ Online $29; kids(under 12)$20/ Online $10

Prior (预先的) bookings are not necessary.

The Backstage Tour

It is a unique opportunity to experience the real-life plays behind the stage! You might even get to stand on the concert hall stage, take up a conductor's baton (指挥棒) in the orchestra pit and imagine you are leading the performance. You will also get to see inside the stars' dressing rooms. The tour includes a free breakfast in the Green Room, the private dining area of performers past and present.

Takes place: Daily at 7 am

Prices: $155

Bookings are necessary. Limited to 8 people per tour. Online sales expire at 4:30 pm two days prior.

Opera High Tea

It consists of a tour where you will walk in the footsteps of world-class singers, dancers, and musicians, followed by fine food and music in the great surroundings of the Bennelong Dining Room. What could be better than a treat of delicious light snacks and soft drinks followed by a live performance by a leading Australian singer? An unforgettable treat for young and old!

Takes place: Every second Wednesday, 2 pm

Duration:1.5 hours

Prices: $145 per person

Book online or visit the Guided Tours Desk.