Here is an astonishing and significant fact：Mental work alone can't make us tire. It sounds absurd．But a few years ago, scientists tried to find out how long the human brain could labor without reaching a stage of fatigue(疲劳). To the amazement of these scientists, they discovered that blood passing through the brain, when it is active, shows no fatigue at all!

    If we took a drop of blood from a day laborer, we would find it full of fatigue toxins (霉素) and fatigue products. But if we took blood from the brain of an Albert Einstein, it would show no fatigue toxins at the end of the day.

    So far as the brain is concerned, it can work as well and swiftly at the end of eight or even twelve hours of effort as at the beginning. The brain is totally tireless. So what makes us tired?

    Some scientists declare that most of our fatigue comes from our mental and emotional (情绪的)attitudes. One of England's most outstanding scientists, J. A. Hadfield, says, “The greater part of the fatigue from which we suffer is of mental origin. In fact, fatigue of purely physical origin is rare. ”Dr. Brill, a famous American scientist, goes even further, He declares, “One hundred percent of the fatigue of sitting worker in good health is due to emotional problems.”

    What kinds of emotions make sitting workers tired? Joy? Satisfaction? No! A feeling of being bored, anger, anxiety, tenseness, worry, a feeling of not being appreciated— those are the emotions that tire sitting workers. Hard work by itself seldom causes fatigue. We get tired because our emotions produce nervousness in the body.

    This could be Micah Fitz, first spring without football practices. The 14-year-old has been playing since he was 3, but because he's home-schooled, he can't try out for the local team at Patriot High School in Prince William County, Virginia.

    “I can't play this half of the year and my friends are going to be playing five or six times a week,” he said. “They're going to be getting better and stronger playing with kids that are good.”

Micah and his family—along with many other home-schooling families across Virginia—are hoping the Virginia General Assemble will approve a bill this year that would allow kids like him to try out for sports on public school athletic teams. The bill, called the “Tebow bill”, is named after football player Tim Tebow, who was home-schooled but was allowed to play on a high school team before going to the University of Florida, where he led his team to two national championships.

    Many major statewide education organizations said the bill wouldn't be fair to public school students. Ken Tilley, the executive director of the Virginia High School League, said the bill would violate two of the league's most long-standing standards for qualification: enrollment (注册入学) and academic standing.

    Home-school advocates argue that they are required by the law to document academic progress. But many opponents say students always have the option of attending public high school. That might be what Sydney Bowman, a 12-year-old from Luchetts, will do to keep wrestling, although she would prefer to continue to be taught at home. In her case, girls' wrestling teams are rare enough that there aren't many options other than public school.

    But Micah' mom, Terri Fits, a former public school teacher, said that although they support the local schools and love to cheer on the teams, they like the flexibility of home-schooling.

    Drive through any suburb in the U.S. Today, and it's hard to miss the recycling bins that have become companions to America's trash cans. Recycling has become common, as people recognize the need to care for the environment. Yet most people's recycling consciousness extends only as far as paper, bottles, and cans. People seldom find themselves facing the growing problem of e-waste.

    E-waste rapidly increases as the techno- fashionable frequently upgrade to the most advanced devices, and the majority of them end up in landfills (垃圾填埋地). Some people who track such waste say that users throw away nearly 2 million tons of TVs, VCRs, computers, cell phones, and other electronics every year. Unless we can find a safe replacement, this e-waste may get into the ground and poison the water with dangerous toxins (毒素), such as lead, mercury, and arsenic. Burning the waste also dangerously contaminates the air.

     However, e-waste often contains reusable silver, gold, and other electrical materials. Recycling these materials reduces environmental problems by reducing both landfill waste and the need to look for such metals, which can destroy ecosystems.

    A growing number of states have adopted laws to ban dumping e-waste. Still, less than a quarter of this waste will reach lawful recycling programs. Some companies advertising safe disposal in fact merely ship the waste to some developing countries, where it still ends up in landfills. These organizations prevent progress by unsafely disposing of waste in an out- of- sight, out- of- mind location.

    However, the small but growing number of cities and corporations that do handle e- waste responsibly represents progress toward making the world a cleaner, better place for us all.

    Scientists used to explore (探测) on the surface of the ocean. Now they are exploring below the surface, too. They want to know about ocean water and the plant and animal life deep in the ocean.

    In 1934 the scientist William Beebe dived 3000 feet below the surface in a hollow steel ball. In 1935 August Piccard dived 10330 feet In I960 his son Jean dived to a depth of 35800 feet. All these early dives were deep. But the divers could not stay down for very long. They had to come back up to the surface after a few seconds. Scientists needed to stay down longer to study life below surface. Gradually they succeeded. Cousteau, a Frenchman, was able to keep men down to a depth of 36 feet for one month and to a depth of 90 feet for a week.

    Now scientists are developing even better equipment. With this new equipment, men can stay below the surface for days or even weeks. In 1962 Cousteau set up a research station 35 feet below the surface. Then, in 1964, he set up another station on the ocean floor of the Red Sea. This was the first undersea station to operate without help from the surface.

    Many countries are now studying undersea living. The former Soviet Union has an undersea laboratory in the Crimean Sea. The United States has a laboratory 50 feet down on the ocean floor off the Virgin Islands. In 1970 five men lived there for two weeks. Then a team of five women scientists stayed in the laboratory. Next came other teams of men. All were there to explore the ocean depths and to make plans for the use of its resources. Scientists hope to find enough mineral, vegetable, and animal wealth there to provide food for the entire world.

    It seems hard to watch someone yawn（打哈欠）and not to yawn ourselves. Even reading about yawning can make you do it. Now, a new study has found why yawning has such a powerful force.

    Yawning when others yawn, the study suggests, is a sign of pity and a form of social connection. Kids don't develop this deeply rooted behavior until around age four, the study found. Kids with autism (自闭症) are less likely to catch yawns. In the most serious cases, they never do. Yawning might help doctors to see whether the children are developing rightly. The work could also lead to a better understanding of the ways that people communicate and connect.

    “Emotional infection seems to be a born thing that connects us together,” said Molly Helt, a graduate student in psychology at the University of Connecticut. “Yawning may be part of that.” Inspiration for her study came when she tried to get her own autistic son to clear his ears on an airplane. She repeatedly yawned at him, hoping he would yawn back. He never did.

    “The fact that autistic kids don't do it might mean they're really missing out on that emotional connection with people around them,” she said. “The biggest thing people try to figure out after birth is how we become humans and understand that humans have minds that are different from others',” she added. “Autistic people never seem to understand that.”

    Like infectious（有感染力的）laughter and crying, scientists have found that yawning is a shared experience that promotes social connection. Helt said it could fight stress after a period of being nervous and spread a feeling of calm through a group.

There are {#blank#}1{#/blank#}(vary) kinds of theme parks in the world, the most famous of which is Disneyland that can {#blank#}2{#/blank#}(find) in several parts of the world. At Disneyland, you can travel through space, visit a pirate ship, or meet adorable fairytale or cartoon characters like Snow White or Mickey Mouse. Whichever and whatever you like, Disneyland is a place {#blank#}3{#/blank#} makes your childhood dreams come true.

{#blank#}4{#/blank#}(locate) in the beautiful Smoky Mountains in the southeastern USA，Dollywood {#blank#}5{#/blank#}(feature) America's traditional southeastern culture. There, you can not only hear famous country music, see skilled workers make wood, glass, and iron objects {#blank#}6{#/blank#} the old-fashioned way, but also experience a superb old wooden roller coaster, which is the {#blank#}7{#/blank#}(long) track in the smallest space.

Chimelong Ocean Kingdom in Zhuhai is one of the leading ocean-themed parks in the world. While visiting the Whale Shark Aquarium, you will feel as if you {#blank#}8{#/blank#}(walk) in the deep ocean, enjoying up to 20,000 fish, {#blank#}9{#/blank#}(include) a whale shark 68 meters long. You can also see all kinds of interesting animals, such as dolphins, sea lions, polar bears, etc. of course, there are plenty of exciting {#blank#}10{#/blank#}(activity) waiting for you to explore by yourself.