Most people have flown a kite or have seen one ride and dip in strong spring wind. Not so many people know that kites were first made in China thousands of years ago. The ancient Chinese were making and flying kites even before they were writing.

    A long time ago, the Chinese made kites to use in wars. They would fly these war kites in the dark. The kites were fixed so that they made strange sounds. Men who were at war with them would hear these sounds and run away. They thought those strange sounds were made by gods in the sky.

    The ancient Chinese also flew kites to bring good luck and to make their crops grow rich and tall. Sometimes they tied long strings and hooks to their kites. Then they would fly the kites over water, letting the hooks hang down to catch fish.

    The Chinese use sticks, strings and paper for their kites. Some of these kites look like animals or trees. Others look like birds or houses.

    It is difficult for doctors to help a person with a damaged brain. Without enough blood, the brain lives for only three to five minutes. More often the doctors can't fix the damage. Sometimes they are afraid to try something. to help because it is dangerous to work on the brain. The doctors might make the person worse if he operates on the brain.

    Dr. Robert White, a famous professor and doctor, thinks he knows a way to help. He thinks doctors should make the brain very cold. If it is very cold, the brain can live without blood for 30 minutes. This gives the doctor a longer time to do something for the brain.

    Dr. White tried his idea on 13 monkeys. First he taught them to do different jobs, then he operated on them. He made the monkeys' blood back to the monkeys' brains. When the brain's temperature was 10℃, Dr. White stopped the blood to the brain. After 30 minutes he turned the blood back on. He warmed the blood again. After their operations the monkeys were like they had been before. They were healthy and busy. Each one could still do the jobs the doctor had taught them.

    Years ago parents worried their children would learn the truth about Santa Claus(圣诞老人)from others, but now they have a new problem—the Internet.

    A recent study from Hide My Ass! Shows 1 in 8 American parents said the Internet told their children the truth about Santa Claus. 44% of parents thought Google was a danger to this Christmas story, as children searched for Santa and found pages explaining he is not real. About 34 percent of children questioned Santa Claus after seeing ads online for gifts they had asked for in their letters to the North Pole (北极). Sadly，one in three children said their Christmas spirit was dead after reading a post saying Santa wasn't real.

    Before the Internet, the only way children found out their parents bought their gifts was if they were in a bad hiding place. Today, two-thirds of parents never clear their browser (浏览器) history, making it easy for kids to find out the gifts under the tree weren't put there by a happy man and his little helpers.

    To keep Mr. Claus alive, “Keep Believing in Santa”, an organization created by Hide My Ass!, helps kids believe in Santa. Parents receive free software from the organization that monitors all online search results and web pages that could tell kids the truth about the man who lives in the North Pole, by hiding any information that may suggest he doesn't exist.

    However, there is still a higher possibility of the Internet now being the main cause of a child's belief in Santa ending, and it can also result in kids finding out sooner than for those born before the digital age.

    ''With this organization, we wanted to give parents a new tool that would allow them to keep the magic of Christmas and the mystery of Santa for that little bit longer,” Cian  Mckenna-Charley, marketing director at Hide My Ass!.

Following My Dream

I grew up in a poor family with six brothers, three sisters, my father and mother. We had little money and few goods, but plenty of love and attention. I was happy and energetic. I understood that no matter how poor a person was, he could still afford a dream. 

My dream was athletics. By the time I was sixteen, I could throw a ninety-mile-per-hour fastball and hit anything moving on the football field. And I was so lucky that my high-school coach was Ollie Jarvis, who not only believed in me, but often told me "The dream is priceless." However, when I was about to get off the ground, one particular thing happened, which almost ruined (毁坏)my long-held dream. 

It was the summer holiday in Senior Two and a friend recommended me for a summer job. I was offered $12.25 per hour. Compared with the average $3.5, that was a big sum. I was so excited, because this meant a chance for money in my pocket, certainly, money for a new bike and new clothes, and the start of savings for a house for my mother. The prospect (前景)of the job was inviting, and I wanted to jump at the opportunity. 

Then I realized I would have to give up summer baseball training to handle the work schedule. I didn't dare to tell my coach. I thought of the advice my mother often gave me when I lacked courage, "If you make your bed, you have to lie in it." I decided to talk to my coach by myself. After all, my dream of buying my mom a house and having money in my pocket was worth facing his disappointment to me. I gathered my courage and knocked at his door…

What should one do even if he was poor in the author's opinion? {#blank#}11{#/blank#}

Why did the author want to give up summer baseball training? {#blank#}12{#/blank#}

What is the coach's attitude towards the author's dream? How do you know that? {#blank#}13{#/blank#}

What would happen when the author knocked at his coach's door? {#blank#}14{#/blank#}

The Ebola virus is an infectious disease that for years had almost no treatments, and it kill s about half the people it infects. Now a new study published in The Lancet Infectious Diseases shows that a promising vaccine （疫苗）, named rVSV△G-ZEBOV-GP, doesn't just help to reduce infections, it also can cut those death numbers in half.

The vaccine is a single-dose （单剂） muscular one that causes cells to produce one of the virus's proteins. "Later, if the person is exposed to Ebola,"explains Rebecca Coulborn, a scientist with Epicentre, the medical research arm of Doctors Without Borders, "their immune system will recognize the viral protein. This recognition allows the immune system to be prepared to attack the virus and protect the person from Ebola virus disease."

Researchers showed rVSV△G-ZEBOV-GP was effective at reducing the risk of infection, but no one knew how capable it was of preventing death in someone who was vaccinated after becoming infected during an epidemic （流行病）. To figure it out, Coulborn and her colleagues focused their efforts on the second-largest Ebola outbreak ever recorded, which occurred in the Democratic Republic of Congo between 2018 and 2020.

"Every single Ebola health facility across the entire Ebola epidemic had a standardized list of all admissions," says Coulborn. This list included 2,279 confirmed Ebola patients, and it recorded whether or not each person had been vaccinated before they got sick—and if so, when they'd received the vaccine.

Coulborn found the death rate was 56% among the unvaccinated. But for those who'd received the vaccine, that rate was cut in half. This was true no matter when someone got vaccinated before the appearance of symptoms. Additionally, those who'd been vaccinated had less virus circulating in their bodies than those who hadn't. So the vaccine played an important role.

Rebecca Coulborn says she feels buoyed by the results—since they offer clear evidence that people who're at risk of contracting Ebola should be vaccinated early. It's an opportunity to cut chains of transmission （传播） and prevent an outbreak before it gains speed.

Brilliant Ways to Deliver Secret Messages

Many effective ways are used now to deliver secret messages. But in the past when the science and technology was not developing, especially during the war, how did people send secret and important messages?

Shoelaces

In the 1950s, the U.S. Central Intelligence Agency created a book of tips to teach spies ways to communicate in public. One tip: Lace up your shoes. Tied one way, the laces might mean "I have information": tied another, "Follow me". The spies could communicate while everyone else probably thought, "That guy can't tie his shoes correctly!"

Tattooed (刺文身) Head

Around 513 B.C., Histiaeus was forced out as the ruler of an ancient city. So he wanted to send a message to his supporters: Rebel against the king who took away his power.

Histiaeus called in a slave, shaved his head and tattooed the message onto the man's skin on the top of head. After the slave's hair grew back, he travelled to Greece with orders to shave his head again. Message received!

Orange Juice

In 1597, John Gerard was imprisoned in the Tower of London in England. He asked the prison guard to let him send letters written in charcoal (木炭). But then he wrote another message on top using the juice from an orange-which was only visible when the juice was dry and the page heated. With his invisible ink, he escaped successfully.

Songs

In the 1800s, African American slaves couldn't talk openly about their plans to escape to freedom—so they secretly sang about it.

Swing Low, Sweet Chariot might sound like a religious song. But for slaves, the "sweet chariot" was the code for the Underground Railroad, the network of people who helped slaves head to northern states and Canada. The song Wade in the Water warned escaped slaves to get in the water so dogs wouldn't smell them. With these songs, hundreds of people escaped slavery.