The robot moved into the fighting ring with confidence.Then it turned around quickly and knocked itself over. The team of Scouts that built the 8-inch -tall machine immediately realized one arm was too long.They would have to work fast---practice time was over , and the real robot matches were about to begin . "We tried to fix it , but by that time , the other teams had more advanced technology ," says Eagle Scout Matthew Patchen , 16. "They were a couple of steps ahead of us ." In the end , Matthew's team didn't win the robot competition . But they had a great time working on their Robotics merit badges at the 2011 Advance Camp in Antioch , Calif . Advance Camp is held the last Saturday in September at the Contra Costa County Fairgrounds in Antioch, Calif.Nearly 1,500 Scouts attended in 2011 and worked on different merit badges .Scouts choose from more than 50 merit -badge classes taught by counselors .They can earn merit badges from Fingerprinting to Nuclear Science to Swimming .Robotics is the most popular class . First , one of the counselors talked to Matthew and the other Scouts in his Robotic class about the many different uses for robots . "I learned how advanced it really is ," Matthew says . "Robots are used in medicine and industry ." After the talk , the Scouts were divided into five-person teams . Each team was required to build a basic robot . The next step was programming the tiny computer in the robot so it would make the right moves once it was in the ring . "We programmed our robot so its arm was moving all the time ," Matthew says . "That way , it would knock the other robot over." . That's when they discovered the arm on their robot was too long . As a result , their robot knocked itself over before it could fight with any other robots . "It was a learning experience ," Matthew says . "You have to think ahead." The author writes this text mainly to _ . A) explain what Scouts do B) introduce an interesting camp C) advertise a robot competition D) encourage Scouts to learn technology
B
The year is 2094. It has been announced that a comet is heading towards the Earth . Most of it will miss our planet, but two pieces will probably hit the southern half of the Earth. On 17 July , a piece four kilometers wide enters the Earth's atmosphere with a massive explosion . About half of the piece is destroyed, but the remaining part hits the South Atlantic at 200 times the speed of sound. The sea boils and a huge hole is made in the sea bed. Huge waves are created and spread outwards from the hole. The wall of water, a kilometer high, rushes towards southern Africa at 800 kilometers an hour. Cities on the African coast are totally destroyed and millions of people are drowned. Before the waves reach South America, the second piece of the comet lands in Argentina. Earthquakes and volcanoes are set off in the Andes Mountains. The shock waves move north into California and all around the Pacific Ocean. The cities of Los Angeles, San Francisco and Tokyo are completely destroyed by earthquakes. Millions of people in the southern half of the earth are already dead, but the north won't escape for long. Because of the explosions, the sun is hidden by clouds of dust, temperatures around the world fall to almost zero .Crops are ruined. The sun won't be seen again for many years. Wars break out as countries fight for food. A year later, no more than 10 million people remain alive. Could it really happen? In fact, it has already happened more than once in the history of the Earth. The dinosaurs were on the Earth for over 160 million years. Then 65 million years ago they suddenly disappeared. Many scientists believe that the Earth was hit by a piece of object in space. The dinosaurs couldn't live through the cold climate that followed and they died out. Will we meet the same and? What is mainly described in the passage? A) A historic discovery. B) An event of imagination C) A research on space. D) A scientific adventure.
B
Q: Teen Climbing Camp 2010 This 5-day climbing camp is suitable for teenagers between the ages of 13 and 18 who have an interest in rock climbing. The climbing days are designed for beginners and those who have some basic experience in a gym or outdoors. Participants will find themselves challenged physically and mentally. Rock Dimensions camps are designed to be a positive and memorable experience by providing healthy communication between participants, individual goal setting, and challenges that lead to personal growth. Dates Monday, June 29-Friday, July 3 Monday, July 27-Friday, July 31 Locations Climbing Tower at Footsloggers Linville Gorge and Table Rock area Local climbing areas near Boone Responsibilities Participants will meet Rock Dimensions guides at our location each morning and at the end of each day. Rock Dimensions will provide all climbing items, including a safety rope, a helmet and climbing shoes for each participant. Participants are responsible for bringing their own lunch, water, small backpack, appropriate clothing, and personal items like sun cream, etc. Pre-camp planning Participants will receive the following information in their registration packet Medical Form, Responsibility Agreement, Clothing/Equipment List, and Directions. Cost $575/person for the 5-day camp $325/person for the first 3 days Anyone interested in participating in just the last two days of the camp should call to discuss pricing and necessary skills/experience. What can we infer from the text? A) Some experience is required of the participants. B) It'll be hard for teens to experience the climbing. C) Parents are required to stay with their children. D) Guides will talk about the prices with parents.
A: B
(Q).
The earth is not the only body that travels around the sun. With it are eight other planets, fellow members of the sun's family. Two of them, Mercury and Venus, are nearer while the other six, namely Mars, Jupiter, Saturn, Uranus, Neptune and Pluto, also in their given order from the sun, are farther from the sun than the earth is. The farther they are, the longer trips they make around the sun. People noticed long ago that these traveling bodies moved around in the sky in definite paths. It is a force called gravity that holds them in their paths. We know that every little bit of matter in the universe pulls upon every other bit of matter. The pull between two bodies is proportional to the product of their masses. Because the sun is so large the pull between the sun and the planets are thus great. If it were not for this pull, the planets would fly off into space. In the same way there exists a pull between the earth and the moon, which keeps the moon traveling in its orbit around our planet, the earth. Gravity holds you to its surface, and pulls back to it the ball which you throw into the air. Of course the ball also pulls on the larger earth but the earth is so much larger that the pull is not noticed. Now remember that large bodies exert a greater pull than smaller ones which contain less material. But each object in the universe, no matter how small, pulls on all other objects to some degree. From the passage we can see _ A) all the objects, big or small, must exert the same pull on one another B) large objects exert the same pull on anybody as small objects C) small objects exert the same on large ones D) each object in the universe exerts a pull on all other objects
(A).
D