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Scientists using X-rays to examine the chemical structure of a small part of the painting discovered a technique Leonardo used in the work. An oil paint used for it was a special, new chemical mixture, which suggests that the Italian artist was in an experimental mood when he worked on the painting in the 16th century.

"He loved to experiment, and each of his paintings is completely different technically," said Victor Gonzalez, a chemist who has studied the chemical element of several works by Leonardo and other artists. The researchers found a rare lead compound (铅化合物) — plumbonacrite, in Leonardo's first layer of paint. The discovery proved that da Vinci most likely used lead oxide to thicken and help dry his paint. The paint in the study is about the thickness of a human hair, lying in the top right area of the painting.

The scientists looked into its atomic (原子的) structure using X-rays, moving particles at the speed of light, permitting researchers to look deeper into the paint structure. "Plumbonacrite is really a fingerprint of his recipe, as it's the first time we can chemically confirm it," Gonzalez said.

Rembrandt, the Dutch master, may have employed a similar blend in his 17th-century paintings. Gonzalez and fellow researchers have also detected plumbonacrite in his art. It's believed that Leonardo used lead oxide powder, which has an orange color, to thicken his oil paint and speed up drying. "What you will get is an oil that has a very nice golden color," Gonzalez said. "It flows more like honey."

But the Mona Lisa — said by the Louvre to be a portrait (肖像) of Lisa Gherardini, the wife of a Florentine silk businessman — There's more to her gaze than meets the eye. "What we are saying is just a little brick in the knowledge," Gonzalez said.

To carry out my mission, I was taken to La Escobilla to experience Wildcoast in action. Just one hour north of Huatulco, this protected beach is where mass turtle nesting happens. The natural phenomenon occurs at 12 beaches around the world, three of which are in Mexico. Having just four days during rainy season, thousands of female sea turtles go ashore to lay their eggs.

Between threats like illegal hunters, natural enemies and oil spills, the hatchlings (幼龟) have the whole world against them. As recently as 2012, turtle hunting was not only common practice, but an important part of the culture and diet in the Oaxacan communities.

Wildcoast rescues turtle eggs and recreates habitats. Thanks to their efforts, various sea turtles have made a major comeback, with now over 72 million turtles being born.

I got to hold 50 of the hatchlings in a bowl. Statistically speaking, just one in 1,000 baby turtles will make it to adulthood. Staring at the bowl, I so badly wanted them to find shelter somewhere in the ocean.

Finally, it was time to set free those little ones. Having made sure no suspicious (可疑的) people were nearby, I let out the hatchlings. With each set of waves, we witnessed the survival of the fittest, some crawling (爬行) past the whitewash while others crashed back to shore. A bunch of birds was ready to div e into the sea for their targets.

"One in 1,000."

Nature was both cruel and sympathetic. After 30 long minutes, the last hatchling made its way to the sea.

For those seeking out the fabled Loch Ness monster, Inverness is the closest train station to the famous lake. From the station, travelers can take a bus or taxi to Fort Augustus and board a boat tour or fishing charter to try to spot the creature. Even if she isn't found, Loch Ness is still a sight for the eyes, with a historic port and trails through the forests and past waterfalls. Being Scotland's second-largest lake and holding more water than any other lake in the U. K., Loch Ness is a great place to fish or boat.

Although a long train ride, the trip from Edinburgh to Mallaig, a charming fishing village, is worth it. This route offers some of the best scenery in the world — in fact, riders might recognize the train, which goes over the Glenfinnan Viaduct, as Harry Potter's Hogwarts Express. Travelers can board the 19th-century-inspired Jacobite Steam Train and wind past attractive villages, the Morar River and beaches.

At an altitude of over 4,412 feet, Ben Nevis is an ancient volcano that exploded and collapsed on itself to become the tallest mountain in the British Isles. Travelers can take the train to Fort William, a town offering castles, distilleries, and rocky coastlines. The town is also titled as the "Outdoor Capital" of Scotland, so thrill seekers can go skiing and hiking to their hearts' desire. If hiking Ben Nevis doesn't sound appealing, there's also a boat tour that provides impressive views.

I faced a tight budget when I was nine. On November Ist, I used up most of the money I saved. With a small amount of pocket money left before Christmas I didn't have enough to buy presents for the family.

I was seriously considering going to my dad and asking for an advance on the next year's pocket money, so I could at least buy gifts for my family members. But then, one evening, I was sitting in my room reading advertisements in the back of a magazine. Several greeting-card companies were telling us how people could make money by selling their cards and stationery (文具). Normally, I would have passed right over the ads, but this time my situation was so difficult that I felt I had nothing to lose.

The ad that attracted me most was one by a well-known greeting-card company in my nation, whose products were of high quality. With my parents' help, I contacted the company, although they preferred adults or older kids to advertise their products. After my sincere request, they agreed to give me, a nine-year-old boy, a chance.

My sales materials arrived within the week. I had expected something small and neat, but the package looked like a dinosaur's shoebox it was close to three feet long and nearly a foot wide, full of stuff. There was a thick binder (活页夹) containing a complete selection of the cards and some writing paper, which I would be selling for around $3 per box.

Although my parents supported my try to make money by myself, they had little confidence in my success; after all, instead of an outgoing kid, I was somewhat shy. However, I was determined to have a try to challenge myself.

注意：

1. 续写词数应为150左右；

2. 请按如下格式在答题卡的相应位置作答。

Wasting no time, I set off and knocked on doors in my neighborhood.

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Eventually, I earned over $20, a large sum of money for a 9-year-old kid in 1954.

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In the area of entertainment, there's a gentle power that our deepest emotions, especially for those with souls. Facing can be depressing, but in pursuing what brings delight is key., it's the simple acts—like or trying to cheer up a friend—that a shift in mood. reminding oneself of these joys ensures that even in adversity(逆境), the heart finds and the spirit remains unbroken. thus, becomes not just a amusement but a comfort for the soul.

When Jack was a small boy, he was once asked to give a speech about "A Big Challenge in My Life". To talk before the whole class, he was(terrible)shy the moment he thought of so many eyes. staring at him. He had no other(choose), though. First Jack was to draft the speech,was just a piece of cake for him because he was a good writer. Because it was not allowed to read from the paper, he (have)to give the speechhis memory and in front of such a big audience!

Gradually he found himself back,(give)out his speech without much difficulty. After what seemed to be a hundred years, he found the audience applauding. He made! From then on, his fear of talking: before an audience disappeared. Actually with his confidence(build) up, Jack now turns out to be a great speaker. As we know, the greater difficulty we meet on our way to(succeed), the more likely we will be to achieve our (goal).

"I treat my body with the respect that any musician would to their4,"says Misty. "I love my body, "she adds.

Was she5 confident? Actually, she was a6 girl and avoided the spotlight. But Misty loved music and movement. When she was thirteen, Misty's teacher suggested she7 a free ballet class at the Boys&Girls Club, For two weeks, Misty sat on the gym bench watching the class, afraid to8 Finally, she gave it a9 At first, she felt10 in the class. She didn't know anything about ballet, and she was11 than most of the students. Over time,12 she began to enjoy the lessons. She discovered that her body-especially her long legs and flexible muscles -was just13 for ballet. After the class season ended, Misty received a scholarship to a nearby dance studio. Most ballerinas (女舞者) start their training much younger than thirteen. But Misty's natural abilities and hard work made her improve quickly.

Over the next five years, ballet was Misty's14. She practiced, performed, competed and attended ballet programs. "Performing was my favourite part because I felt15 and open onstage, she says. "For the first time in my life, I felt like I belonged. "

Schedule yearly exams.

Experts advise parents to bring babies 6 to 12 months of age to the doctor for a careful check. The good news is that millions of children now can have yearly eye exams and following treatment, including eyeglasses.

Protect against UV rays .

Long-term stay in the sun creates risk to your eyes. No matter what the season is, it's extremely important to wear sunglasses. Give your eyes a break.

Two-thirds of Americans spend up to seven hours a day using computers or other digital products. Experts recommend that people practice the 20/20/20 rule: every 20 minutes, take a 20-second break and look at something 20 feet away.

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As part of a healthy diet, eat more fruits and vegetables each day. Vitamins C and E help protect eyesight and promote eye health.

Practice safe wear and care of contact lenses.

Many Americans use contact lenses to improve their eyesight. While some follow the medical guidance for wearing contact lenses, many are breaking the rules and putting their eyesight at risk.

Otherwise: you may have problems such as red eyes, pain in the eyes, or a more serious condition.

A. Eat your greens.

B. Eye care should begin early in life.

C. They can properly protect your eyes.

D. Stay in good shape by taking more vitamins.

E. Parents usually don't care about their own eyesight.

F. Always follow the doctor's advice for appropriate wear.

G. This frequent eye activity increases the risk for eye tiredness.

I received much ridicule (嘲笑) from my friends for this because they thought I was ignoring them for Lisa. My family education taught me to be nice, and I felt Lisa's needs were much more important than others I knew.

It had been months since Lisa was in our class, and one day our teacher was crying. She explained Lisa died the day before and would no longer be our classmate. She told us Lisa had fought a battle (斗争) with cancer for years.

I was shocked. Lisa never spoke of her illness as if it could kill her. Well, all these years I have kept Lisa in my mind and heart. When I go through the important events in my life, I think of Lisa.

I've had a strong wish recently to find her mother and father. I'd like to tell them that though they never met me, their daughter had a sweet effect on my life. I have no idea what her parents' first names are. I write to your column (专栏) and hope you can point me in the right direction.

Lisa was such a lovely girl. Maybe her parents would be comforted by the fact that after all these years they are not the only ones who remember her.