Have you ever heard that we humans use only ten percent of our brains? This opinion holds a certain appeal because if it were true, then we could instantly become ten times more intelligent just by firing up that sleepy majority of the brain! The idea that we use only a small part of the brain dates back to animal experiments in the 19th century. When scientists stimulated a specific part of the brain, the animal moved its leg or tail. If a tiny part of the brain could do something so great, what was the use of the rest of the brain? Some scientists assumed that large parts of the brain were simply useless. Then, in the early 20th century, scientists observed that stimulating certain parts of the brain had no physical effects. They named these seemingly useless parts of the brain the "silent cortex." Today we know that in humans, much of the "silent cortex" is actually devoted to complex activities like language, learning, and imagining. Brain scans have shown that different parts of the brain become much more active as we shift our attention and focus, but even as we sleep, many areas of the brain are extremely active. Would you be smarter if your entire brain constantly worked to maximum capacity ? Interestingly enough, the opposite is probably true. The less brain activity you need to perform a given task, the more the brain as a whole is able to do. "Silent cortex" has proved to be _ . A) sensitive to stimulation B) useful in complex activities C) responsible for physical reaction D) more active than the other parts of the brain
B

When I was young, I wished for a good car and a big house. That was my idea of success. I took all the advanced classes and tried to do well in the exams with my mind set on going to a key school. I just knew that I would somehow become famous and be able to afford the car and the dream house. All the way through junior years, my mind was planning this beautiful future. Then in the eleventh grade, many losses changed my mind. First, one of my friends died at 16. Soon after, my great-grandmother passed away, followed by my beloved fourth-grade teacher. These events left me not knowing what to do or where to go . Death had never touched me so closely. After a long period of emptiness, it finally struck me: Life is not promised and neither is future success. Though I was attempting to achieve material success, I was not enjoying my daily life. I realized that finding inner peace, purpose and happiness will stick with me forever and that is real success. Enjoying life's precious quirks ( ) makes an ordinary person more successful than a wealthy person who isn't content and takes everything for granted. The summer before senior years, my attitude changed greatly. Instead of memorizing facts, I began learning skills. Instead of focusing on the future, I focused on today and the many blessings and successes that came with it. I still get excellent grades, but now I devote weeks to studying instead of struggling for exams, and I think about the future with a deeper sense of meaning. For me, being successful means truly living life each day. According to the passage, which of the following is true? A) The writer thinks that success is not promised. B) His teacher died before the death of his grandpa. C) The writer didn't do well in all the exams. D) He didn't want to take all the exams.
A

August was one of the nastiest months I can remember: torrential rain; a hailstorm or two; cold, bitter winds; and mists. But we are accustomed to such weather in England. Lord Byron used to say that an English summer begins on July 31 and ends on Aug. 1. He called 1816 "the year without a summer." He spent it gazing across Lake Geneva, watching the storms, with 18-year-old Mary Shelley. The lightening flickering across the lake inspired her Frankenstein, the tale of the man-made monster galvanized into life by electricity. This summer's atrocious weather tempted me to tease a Green whom I know. "Well, what about your weather theory now?" (One of the characteristics of Greens is that they know no history.) He replied: "Yes, this weather is unprecedented. England has never had such an August before. It's global warming, of course." That's the Greens' stock response to anything weather-related. Too much sun? "Global warming." Too little sun? "Global warming." Drought? "Global warming." Floods? "Global warming." Freezing cold? "Global warming." I wish the great philosopher Sir Karl Popper were alive to _ the unscientific nature of global warming. He was a student when Albert Einstein's General Theory of Relativity was first published and then successfully tested. Einstein said that for his theory to be valid it would have to pass three tests. "If," Einstein wrote to British scientist Sir Arthur Eddington, "it were proved that this effect does not exist in nature, then the whole theory would have to be abandoned." The idea that human beings have changed and are changing the basic climate system of the Earth through their industrial activities and burning of fossil fuels--the essence of the Greens' theory of global warming--has not much basis in science. Global warming, like Marxism, is a political theory of actions, demanding compliance with its rules. Those who buy in to global warming wish to drastically curb human economic and industrial activities, regardless of the consequences for people, especially the... Sir Arthur Eddington could be inferred as a _ . A) politician B) poet C) Greenpeacer D) physicist
D