You will spend hours at the gym training your body, but do you ever think about training your brain? Here are four ways to keep your brain mentally active and healthy. Play games Your brain is a muscle just like the ones in the rest of your body. If you don't use it, you will lose it. For example, doing a crossword puzzle once a day is a good way to give the brain the exercise it needs. This kind of puzzle is good at training different areas of the brain. But remember that when doing this puzzle, you should gradually increase the complexity ; otherwise, it will become repetitive and stop being mentally challenging. Talk aloud Although it might sound strange to you, talking aloud is a great way to _ your memory. A good exercise to try is counting to 99 in threes as fast as you can. Be a team leader If you find you can do your work very easily, you should find a new task. It is important that your job should be mentally challenging. Complex jobs are often more challenging and make the brain work a little harder. Learn a language A study found that, compared with those who could speak only one language, the people who could speak two languages had a slower rate of cognitive decrease. Learning a new language is very challenging and it makes sure that different areas of the brain have their lights on. We should gradually increase the complexity when doing crossword puzzles because _ . A) if we don't use our brain, we will lose it B) we should make our brain face different challenges C) our brain is a muscle like other parts in our bodies D) these puzzles can work on different areas of the brain
B
(Question)
Now that military dogs are taking on a larger role in fight, they' re also taking on more of the risks that come with going to war, including developing post-traumatic stress disorder.The New York Times reports that more than 5 percent of the approximately 650 deployed military dogs are developing some form of canine PTSD . "It really is difficult, because cace the dog experiences these traumatic explosions, it's the same as the troops," Army Lt.Col. Richard A Vargus, chief of the law enforcement branch at CENTCOM told the Military Times in September."Some dogs move right through it and it doesn't affect them.Some dogs, it takes some retraining, and some dogs just refuse to work." Like humans, military dogs exhibit a range of changes in temperaments when they develop PTSD.Some become aggressive, others retreat.But because dogs can't express what the problem is, soldiers can be put at risk if their partner simply stops doing his job without warning. "If the dog is trained to find improvised explosives and it looks like it's working, but isn't, it' s not just the dog that' s at risk," Dr.Walter F.Burghardt Jr., chief of behavioral medicine at the Daniel E.Holland Military Working Dog Hospital at Lackland Air Force Base, told the Times."This is a human health issue as well." And searching for such devices has become a key responsibility for military dogs.Even after spending six years and nearly $ 19 billion on experimenting with innovative ways to detect bombs, the Pentagon admitted in 2010 that its most sophisticated technology was no match for a dog' s nose. "Electronic equipment is great in the laboratory, but out on the battlefield, you can't beat the dogs," Bill Childress, manager of the Marine Corps working dog program told the Los Angeles Times. Just as physicians have yet to find a safe way to treat PTSD among humans, so too are veterinarians weighing a wide range of options when it comes to helping their canine patients But offering dogs the same innovative treatments that their human counterparts get,... What is the theme of the passage? A) Military Dogs Are Hard to Train B) Electronic Equipment And Military Dogs C) Military Dogs Play A key Role In Wars D) PTAD Diagnosed Among Military Dogs
(Answer)
D
Ques: Some people learn a second language easily. Others have trouble learning a new language. How can you help yourself learn a new language, such as English? There are several ways to make learning English a little easier and more interesting. The first step is to feel positive about learning English. If you believe that you can learn, you will learn. Be patient. You do not have to understand everything all at once. It is natural to make mistakes when you learn something new. We can learn from our mistakes. In other words, do not worry about taking risks. The second step is to practice your English. For example, write a diary every day. You will get used to writing it in English, and you will feel comfortable expressing your ideas in English. Several weeks later, you will see that your writing is improving. In addition, you must speak English every day. You can practice with your classmates outside class. You will make mistakes, but gradually you will become comfortable communicating in English. The third step is to keep a record of your language learning. You can write this in your _ . After each class, think about what you did. Did you answer a question correctly? Did you understand something the teacher explained? Perhaps the lesson was difficult, but you tried to understand it. You must be positive about learning English and believe that you can do it. It is important to practice every day and make a record of your achievements. You will enjoy learning English, and you will feel more confident in yourself. To feel positive about learning English means _ . A) if you are patient, you will learn B) if you keep a record, you can improve C) if you believe you can learn, you will learn D) if you make mistakes, you can learn from your mistakes
Ans: C
It is an aerial performance far beyond the capabilities of even the most complex modern aircraft: landing upside down on a ceiling. But it is routine business for bats, and now scientists have learned precisely how they do it. Brown University scientists observed two species: Seba's short-tailed bat and the lesser dog-faced fruit bat. They tracked their motions using three high-speed video cameras taking images at 1,000 frames per second, and studied weight distribution in the bats' body and wings. They found that by flapping both wings while folding one of them just a bit toward their body, a bat can shift its centre of mass to perform a midair flip in order to land on a ceiling. "Flying animals all move skillfully constantly as they fly through a three-dimensional environment," Brown biology and engineering professor Sharon Swartz said. "Bats employ this specific technique every time they land, because for a bat, landing requires reorienting from head forward, back up, belly down, to head down, toes up." When approaching their touchdown spot, bats are not flying very quickly, making it difficult to gather the type of aerodynamic forces produced by pushing against the air that could help position them for an upside-down landing. But their heavy wings enable them instead to create inertial forces to adjust themselves in midair. Swartz said bats, as nocturnal animals, are generally not fully appreciated as skilled pilots. "People have many opportunities to observe birds and insects flying, but the bat world is hidden in the night. The more we observe flight behavior in bats, the more we are impressed," Swartz said. Why aren't bats generally recognized as skilled pilots? A) Their flying skills are controversial. B) Their flight behavior is hard to understand. C) They're not the most skilled in flying. D) They're primarily active at night.
D