The temperature of the sun is over 5,000 degrees Fahrenheit at the surface, but it rises to perhaps more than 16 million degrees at the center. The sun is so much hotter than the earth that matter can exist only as a gas, except at the core. In the core of the sun, the pressures are so great against the gases that, despite the high temperature, there may be a small solid core. However, no one really knows, since the center of the sun can never be directly observed. Solar astronomers do know that the sun is divided into five layers or zones. Starting at the outside and going down into the sun, the zones are the corona, chromosphere, photosphere, convection zone and finally the core. The first three zones are regarded as the sun's atmosphere ends and the main body of the sun begins. The sun's outermost layer begins about 10,000 miles above the visible surface and goes outward for millions of miles. This is the only part of the sun that can be seen during an eclipse such as the one in February 1979. At any other time, the corona can be seen only when special instruments are used on cameras and telescopes to shut out the glare of the sun's rays. The corona is a brilliant, pearly white, filmy light, about as bright as the full moon. Its beautiful rays are a sensational sight during an eclipse. The corona's rays flash out in a brilliant fan that has wispy spikelike rays near the sun's north and south poles. The corona is thickest at the sun's equator. The corona rays are made up of gases streaming outward at tremendous speeds and reaching a temperature of more than 2 million degrees Fahrenheit. The rays of gas thin out as they reach the space around the planets. By the time the sun's corona rays reach the earth, they are weak and invisible. Matter on the sun can exist only in the form of gas because of the sun's _ . A) size B) age C) location D) temperature
D
(Question)
Dogs have an amazing sense of smell thanks to 300million smell receptors in their noses, compared to only five million in the human nose. Medical dogs are trained by smelling samples of people already diagnosed with cancer and those of people without the disease so they can learn to tell the difference. Dr Claire Guest began training her dog Daisy to smell out the killer disease in urine and breath samples when she was young. So far Daisy has found cancer in 551 patients, of which 93 per cent were accurate. And she discovered Dr Guest's breast cancer before it was diagnosed- the first time she has discovered the disease actually growing in someone's body, rather than by smelling a sample. Dr Guest, 50, chief executive of charity Medical Detection Dogs, said: "She pushed against my body with her nose repeatedly - I pushed her away, but she pushed against me again, clearly upset. She pushed me so hard that it hurt me. "Her behaviour was totally out of character - she was normally such a happy dog ... I felt the tender area where she'd pushed me, and over the next few days I discovered the tiniest lump . "If it wasn't for Daisy it would have gone hidden for much longer and could have been more serious," Dr Guest added. "My own pet labrador saved my life." Animal rescue charity Blue Cross presented Daisy with a medal for her achievements. She faced tough competition, including JJ, a bomb detection dog who has saved soldiers' lives in Afghanistan. Steve Goody, the charity's deputy chief executive, said: "Cancer affects the lives of thousands of people and Daisy has made a huge contribution to the diagnosis and early treatment of cancers - she's a very deserving medal _ t." Daisy is now helping to train a team of 12 dogs at Medical Detection Dogs and is a 'senior consultant' for the UK's first ever trial using dogs to discover breast cancer. How did Daisy discover Dr Guest's cancer? A) By smelling the urine sample. B) By smelling the breath sample. C) By smelling the hidden cancer. D) By pushing Dr Guest hard.
(Answer)
C
Your beliefs are very powerful and have the power to create or to destroy your life. In most cases, whatever you believe is what you will become. If you believe that you are a loser, that you never get a breakthrough in life, and that you can't accomplish(succeed in doing) anything, these things will be your reality. Believe that you are unlimited, that you can do anything you hope to do and when you do, your accomplishments will know no bounds. You control your beliefs, and that is how you finally control your life. This is a very important point. So how do you develop beliefs that will empower you? Many of our beliefs come from our environment, the world we live in on a daily basis. If your environment is limiting your beliefs, then work very hard on changing it. If you are constantly around people who are negative and limiting, find other people to hang out with and get around positive, successful people. Beliefs also come from past experiences. That is why it is so important to experience success on a regular basis. Set small achievable goals, and then try your best to reach them. "I will finish this project by early afternoon." "I will make six calls on the phone in the next hour." "I will exercise 20 minutes tonight." When you start to experience success, then you start to believe in success, and that leads to more and bigger successes. Beliefs come from knowledge. The more you learn, the more things you will possibly know. Always take the advantage of opportunities to learn something new. It will bring new possibilities into your beliefs and your life. Most importantly, you can develop new beliefs by setting and visualizing goals for your life. Define your goals clearly. Then in your mind, see yourself achieving them in all of their sensory details. Mentally live the experience, see the sights, hear the sounds, smell the aroma, and feel the feelings. The beliefs formed in this way will lead you to their reality. Which of the following statements is true? A) You should try your best to help the negative people around you. B) You should try to achieve small success to believe in success first. C) The more knowledge you learn, the more you will control your life. D) You should stick to your own beliefs without changing.
B