Larry Ritsema was out for an early morning jog around his neighborhood one day. On a quiet street, he began to feel weak. Suddenly, everything went black. Larry fell to the ground.

    Less than a minute later, Tom Alguire passed by on his bicycle. He caught sight of a man lying on the roadside, so he jumped off his bike and ran over. He recognized Larry immediately, because he had been Larry's doctor for nearly 20 years.

    Dr. Tom felt for a pulse (脉搏) at first. Finding none, he began to give Larry first aid. It wouldn't restart Larry's heart, but it would keep the blood flowing until someone else arrive d. Tom could only hope someone would come by soon, at around six o'clock in the morning on a holiday weekend. Tom couldn't stop pressing Larry's chest to run for help — Larry's brain cells would die without the blood. And Tom didn't have a cell phone with him.

    Soon, a car did drive by. But the driver ignored Tom's appeal for help. What was he going to do? Tom was very worried. Finally, another car came down the road, driven by Michael Saliot, a U.S. Coast Guard Officer. Michael wasn't one to pass up a chance to help a person in need. He quickly dialed 911.

   Doctors then found that Larry had suffered a heart attack and there were severe blockages in two of Larry's major arteries (动脉). Only the timely arrival of Dr. Tom saved his life.

   How did Dr. Tom happen to be bicycling that morning, down that quiet street? It turned out that as Tom rode, his bike chain fell off. He spent about eight minutes fitting it back; otherwise, he would have seen nothing of Larry's problem.

    Astronomy (天文学) is the oldest science known to man. Thousands of years ago man looked at the stars and wondered about heavens(天堂). But the six planets that he could see with his eyes alone limited man.

    The Greeks studied astronomy over 2,000 years ago. They could see the size, color, and brightness of a star. They could see its place in the sky. They watched the stars move as the seasons changed. But the Greeks had no tools to help themselves study the heavens.

    Each new tool added to the field of astronomy helped man reach out into space. Until there were telescopes(望远镜), man did not know much about the moon. He did not know that the planet called Saturn(土星) had rings around it. His sight was so limited that he could not see all the planets. In the early 1700s, people thought there were only six planets. Pluto (冥王星), the last of the nine planets to be discovered was seen until 1930.

    Before the spectroscopes (分光镜), man didn't know what kind of gas was in the sun or other stars, without radio telescopes(射电望远镜), we did not know that radio noise came from far in space.

    Today, astronomy is a growing science. We have learned more in the past fifty years than in the whole history of astronomy.

    Everyone should be so lucky as to have a friend like Francia Raisa. On Thursday, singer and actress Selena Gomez, 25, used Instagram to explain why she was “laying low” this summer. She posted a photo of herself in a hospital bed with her friend Francia Raisa holding hands. She said she recently received a kidney transplant from her best friend because of complications（并发症）from lupus（狼疮）, an autoimmune disease, which means it is the result of the immune system attacking normal tissue, including the kidneys, brain, heart and lungs.

    People with lupus may first experience tiredness, joint pain or a little bit of rash（皮疹）on their bodies and can go for a long time before their doctors realize it is more serious. Many people see two or four doctors before the real problem is picked up. According to Dr. Kyriakos Kirou, roughly a third to one-half of people with lupus develop kidney disease, and up to one in five of them will eventually need a transplant, sometimes because they weren't treated with effective drugs to prevent the immune system from attacking the kidneys. Though Gomez said that she was “very well now,” she warned about the dangers of not taking medical diagnoses seriously, like she initially did.

    Her Instagram post also called attention to two major health topics: the need for living organ donators and the fact that Gomez represents three groups more likely to be diagnosed with lupus and lupus-related kidney disease. Nine out of 10 people diagnosed with lupus are women, and most develop the disease between the ages of 15 to 44. And lupus is two to three times more common among women of color, including Hispanic women, according to the Lupus Foundation.

    Raisa is Latina, and Gomez's father is of Mexican origin. While it's not essential that the organ donator and receiver be of the sane ethnicity, people who share a similar background sometimes are better matched, according to data from the United Network for Organ Sharing.

    Everyone can try his best to achieve something. We don't need to be the best, but to challenge the limits of what we are capable of. I gained this belief from my third grade teacher, the most special, honored, trustworthy, and beloved person in my life.

    Mr. Myrus was always perfectly dressed and spoke with the belief that talking to an eight－year－old child didn't mean he had to sacrifice proper statements or grammar. And he was demanding, but he wasn't unreasonable or cruel. He simply felt that no matter what your best was, you should achieve it.

    Luckily enough, I met him again as my eighth grade math teacher. I was not, nor ever will be, gifted in math. I remember my struggles in class. “I don't know the answer,” I would say. "I can't do it!" “Perhaps you don't know the answer,” he would say quietly. “Do you think we might figure it out together? How do you know what you can do if you don't have a try？”

    Mr. Myrus lived around the corner, and I would often stop by to talk while he worked in his garden. I knew there was someone who let me know that if I had really tried, that was enough. “Don't be so hard on yourself,”he'd say.“ Stop blaming yourself. Did you try your best? Well, then you're not a failure,” he often told me these words.

    Mr. Myrus died in 1978. I had never thought about his death. He was too young. I felt sorry. But when I think about him now, I don't feel so sorry. He taught me to be kind, not only to others, but to myself. He taught me my own value. He taught me about honor, about truth, and about doing my best and he also taught me that all feelings and beliefs have dignity and deserve respect. And of all the things I know, I believe that we can't all be “the best”, but we can, each of us, be our best. And I know that's true because Mr. Myrus told me that.

    What do you remember about your life before you were three? Few people can remember anything that happened to them in their early years. Adults' memories of the next few years also tend to be unclear. Most people remember only a few events—usually ones that were meaningful and distinctive, such as being hospitalized or the birth of a new baby.

    How might this inability to recall early experiences be explained? The passage of time does not account for it; adults have excellent recognition of pictures of people who attended high school with them 35 years earlier. Another seemingly reasonable explanation—that infants do not form enduring memories at this point in development—also is incorrect. Children two and a half to three years old remember experiences that occurred in their first year, and eleven month olds remember some events a year later.

    However, three other explanations seem more promising. One involves physiological changes relevant to memory. Maturation of the frontal lobes (额叶) of the brain continues throughout early childhood, and this part of the brain may be critical for remembering particular episodes in ways that can be recalled later. Demonstrations of infants' and very young children's long-term memory have involved their repeating motor activities that they had seen or done earlier, such as reaching in the dark for objects, putting a bottle in a doll's mouth, or pulling apart two pieces of a toy. The brain's level of physiological maturation may support these types of memories, but not ones depending on clear verbal descriptions.

    A second explanation involves the influence of the social world on children's language use. Hearing and telling stories about events may help children store information in ways that will endure into later childhood and adulthood. Through hearing stories with a clear beginning, middle, and ending children may learn to take out the idea of events in ways that they will be able to describe many years later. Consistent with this view parents and children increasingly engage in discussions of past events when children are about three years old. However, hearing such stories is not sufficient for younger children to form enduring memories. Telling such stories to two year olds does not seem to produce long-lasting verbalizable memories.

    A third likely explanation for infantile memory loss involves mismatch between the ways in which infants encode information and the ways in which older children and adults recall it. Whether people can remember an event depends critically on the fit between the way in which they earlier encoded the information and the way in which they later attempt to recall it. The better the person is able to reconstruct the perspective from which the material was encoded, the more likely that recall will be successful.

Located in southern Anhui Province, Mount Huangshan (黄山) covers {#blank#}1{#/blank#} area of 250 kilometers, of {#blank#}2{#/blank#} 154 square kilometers are scenic attractions. Its landscape features "four wonders" of imposing peaks, spectacular rocks, odd-shaped pines, and a sea of clouds. 

Mount Huangshan boasts 72 peaks, more than 1, 000 meters above sea level, with three main peaks rising majestically. They are both fascinating and {#blank#}3{#/blank#}(danger). Cliffs, stone forests, stone pillars, stone blocks and egg-shaped stones form the unique granite geomorphological(地貌的） scenery. 

The pines on the mountain are tall and have fascinating{#blank#}4{#/blank#}(shape). The famous Welcoming Guests Pine (Yingke Song) (1, 500 years old) and See-Guest-Off Pine have become a symbol of being faithful, unyielding(不屈的) and hospitable. More than 200 days each year on Mount Huangshan are misty and cloudy. The vapors coagulate(凝结）to form a sea of clouds. As the clouds cloak the mountain, they give a feeling of being in fairyland. 

Mount Huangshan has more than 400 famous scenic attractions of which 140 have been developed and opened to {#blank#}5{#/blank#}(tour). 

In 1990, Mount Huangshan went on both the world cultural {#blank#}6{#/blank#} natural heritage lists. Is it really so beautiful?