{#blank#}1{#/blank#} The Center for Injury Research and Policy at Nationwide Children's Hospital in Ohio did the study. It was published in the American Journal of Preventative Medicine. The study found a sixty-three percent increase in the number of people treated for rock climbing injuries in American hospitals.

    The study said forty thousand people were treated in emergency rooms. {#blank#}2{#/blank#} The ankle was the most common body part to be injured.

    {#blank#}3{#/blank#} The average age was twenty-six. Fifty-six percent of the injuries were to people twenty to thirty-nine years old. Women made up twenty-nine percent of the injured population. That is more than that in past rock climbing studies.

    {#blank#}4{#/blank#} But many people think it is worth it. John Bachar said rock climbing felt like being on another planet. Dean Fidelman says it is a continual challenge and a beautiful form of movement. And, for Sarah Bowman, she has just started her way up the rocks.

    Dean Fidelman said that he believes a climber's ego(自我价值感) can be his worst enemy on a rock. {#blank#}5{#/blank#}

A. Like many other sports, rock climbing can be dangerous.

B. Climbers in the study were from ages two to seventy-four.

C. The most common injuries were broken bones and sprains in legs and feet.

D. They try to move as silently up the wall as they can.

E. A recent study shows a sharp increase in rock climbing injuries between 1990 and 2007.

F. There's no other sport where you're really going up and down.

G. He said rock climbing is a high risk sport in which many people overestimate their abilities and underestimate the rock.

Johnson Smith
Founder and CEO
Johnson Review

    Welcome to one of the largest collections of footwear（鞋类）in the world that will make you green with envy. Here at the Footwear Museum you can see exhibits（展品）from all over the world.You can find out about shoes worn by everyone from the Ancient Egyptians to pop stars.

Room 1

    The celebrity（名人）footwear section is probably the most popular in the entire museum.Started in the 1950s, there is a wide variety of shoes and boots belonging to everyone from queens and presidents to pop stars and actors! Most visitors find the celebrities' choice of footwear extremely interesting.

Room 2

    Most of our visitors are amazed and shocked by the collection of "special purpose" shoes on exhibition here at the Museum of Footwear.For example,there are Chinese shoes made of silk that were worn by women to tie their feet firmly to prevent them from growing too much!

Room 3

    As well as shoes and boots,the museum also exhibits shoe-shaped objects.The variety is unbelievable.For example,there is a metal lamp that resembles a pair of shoes,and Greek wine bottles that like legs!

The Footwear Library

    People come from all over the world to study in our excellent footwear library.Designers and researchers come here to look up information on anything and everything related to the subject of footwear.

    Back in the 1860s, a British scientist named Henry Walter Bates noticed something interesting in the animal world: a kind of butterfly, Common Mormon, can change the pattern on its wings so that it looks like another butterfly species, the Common Rose, which is poisonous for birds to eat.

    Bates argued that animals develop this ability to protect themselves from being eaten. This theory had been widely accepted by scientists. But one question remains: how do these animals manage to do that?

    After more than 150 years, scientists are finally able to answer that question-it is all down to a gene(基因) called “doublesex", according to a study published on March 6 in the journal Nature.

    In fact, scientists have long known that genes are responsible for this useful ability. But until the new study, scientists hadn't been able to find out which genes in particular were responsible.

    Scientists at the University of Chicago compared the genetic structures of the Common Mormons that changed their wing patterns with those of ones that did not. And all the results pointed to a single gene, “doublesex”.

    This was much to the scientists' surprise. They used to expect that something as complex as this would be controlled by many different genes. For example, one gene would control the color of the upper part of the wing, one would do so for the lower part.

    However, the “doublesex” gene doesn't quite do everything by itself. Instead, it acts like a switch-it “tells” other genes to change the wing patterns. Isn't that clever?

    Scientists believe that this special ability of the “doublesex” gene on Common Mormon was developed throughout the long history of evolution. “The harmless species gains an advantage by resembling something predators(捕食者) avoid,” Sean Carroll, a scientist told Nature. “it was obvious evidence for natural selection.”

    Choosing a vacation place your kids would love is quite a headache. Here are some highly preferred fun vacation places for you, which would make sure your entire family has fun together.

Hersheypark

    Hersheypark, the “Chocolate Town” of USA, in Hershey, Pennsylvania, is now a main theme park with sixty rides. The amazing water rides, family rides, live concerts and shows make Hersheypark a perfect place for the young children. It also has a water park known as the “The Boardwalk at Hersheypark” and a zoo.

Old Orchard Beach in Saco, Maine

    The Old Orchard beach, where there is the amazing sand, water, rides, some fried food, and great fun games, can keep your kids busy and happy. Besides, there are downtown shops with great beach food.

Snowbird Resort in Snowbird, Utah

    As a great place for those who enjoy the snow, Snowbird Resort allows families to enjoy many activities in the winter months, such as snowboarding and ice skating. The live music concerts are held year round.

Hilton Waikoloa Village in Waikoloa, Hawaii

    This is actually a fun vacation place when you are looking out for a getaway with your kids. Hilton Waikoloa Village is the place to go if you would like to have your children enter for Camp Menehune. Looking for the chance to feed birds is an exciting experience. However, an activity that your kids would enjoy most is the communication with dolphins.

    A team of engineers at Harvard University has been inspired by Nature to create the first robotic fly. The mechanical fly has become a platform for a series of new high-tech integrated systems. Designed to do what a fly does naturally, the tiny machine is the size of a fat housefly. Its mini wings allow it to stay in the air and perform controlled flight tasks.

    "It's extremely important for us to think about this as a whole system and not just the sum of a bunch of individual components (元件)," said Robert Wood, the Harvard engineering professor who has been working on the robotic fly project for over a decade. A few years ago, his team got the go-ahead to start piecing together the components. "The added difficulty with a project like this is that actually none of those components are off the shelf and so we have to develop them all on our own," he said.

    They engineered a series of systems to start and drive the robotic fly. "The seemingly simple system which just moves the wings has a number of interdependencies on the individual components, each of which individually has to perform well, but then has to be matched well to everything it's connected to," said Wood. The flight device was built into a set of power, computation, sensing and control systems. Wood says the success of the project proves that the flying robot with these tiny components can be built and manufactured.

    While this first robotic flyer is linked to a small, off-board power source, the goal is eventually to equip it with a built-in power source, so that it might someday perform data-gathering work at rescue sites, in farmers' fields or on the battlefield. "Basically it should be able to take off, land and fly around," he said.

    Wood says the design offers a new way to study flight mechanics and control at insect-scale. Yet, the power, sensing and computation technologies on board could have much broader applications. "You can start thinking about using them to answer open scientific questions, you know, to study biology in ways that would be difficult with the animals, but using these robots instead," he said. "So there are a lot of technologies and open interesting scientific questions that are really what drives us on a day to day basis."