Read the following article and select the best answer. Article: Papa's Straw Hat Papa was a ranger. He worked with horses. He always wore clean clothes with a hat even when he worked. His hat was always the same kind of a cowboy hat- large black hat of heavy wool. He wore his hat full and high. I think he wanted to look taller than he really was. Mama was proud of the way he looked when he wore his hat and his best clothes. But in some way she got the idea that papa would lose his hair if he kept wearing a heavy wool cowboy hat in the hot weather. She began to talk about his hats. "Papa," she said one day, "why don't you get a nice cool straw hat? That heavy wool cowboy hat may cause losing hair!" Papa laughed at her and explained that the horses wouldn't recognize him if he changed the hat. But she didn't believe him. Mama talked and talked about the hat all summer long. At last papa answered, a little angry, "It would not the cowboy hat but a wife's talking about the hat that makes me lose my hair." Mama had a very serious look on her face. She went straight out and later came home with a straw hat. It was a bad year for ranger and we didn't have much money. She thought that if she spent the money for a straw hat, papa would wear it. When papa saw the hat, his face got red. Without a word, he pulled the straw hat down over his head until it hid his eyes and went on to train the horses. He was a good ranger and gentle to his horses. But as papa got close to the horses this time, they jumped high into the air, raising their front feet. All of them ran around in the rounded field and then raced toward the barn. Papa began to shout "Woo boys. Steady boys, steady." But there was nothing equal to. Papa walked back straight to the stove in the kitchen, pushed the straw hat deep down into the fire then turned to mama, in a way that even frightened me. "Now listen to me, mama. Understand this I will never wear a straw hat or any other kind of hat my horses do not like." Then he put on his wool cowboy hat and walked out of the house. I never heard mama talk any more about hats.... Question: According to the passage, a ranger is _ . - a person wearing a woolen hat - a position requiring clean clothes - a person training horses for some purpose - a person riding a carriage with horses
a person training horses for some purpose

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Read the following article and select the best answer. Article: Eddie McKay, a once-forgotten pilot, is a subject of great interest to a group of history students in Canada. It all started when Graham Broad, a professor at the University of Western Ontario, found McKay's name in a footnote in a book about university history. McKay was included in a list of university alumni who had served during the First World War, but his name was unfamiliar to Broad, a specialist in military history. Out of curiosity, Broad spent hours at the local archives in a fruitless search for information on McKay. Tired and discouraged, he finally gave up. On his way out, Broad's glance happened to fall on an exhibiting case showing some old newspapers. His eye was drawn to an old picture of a young man in a rugby uniform. As he read the words beside the picture, he experienced a thrilling realization. "After looking for him all day, there he was, staring up at me out of the exhibiting case," said Broad. Excited by the find, Broad asked his students to continue his search. They combed old newspapers and other materials for clues. Gradually, a picture came into view. Captain Alfred Edwin McKay joined the British Royal Flying Corps in 1916. He downed ten enemy planes, outlived his entire squadron as a WWI flyer, spent some time as a flying instructor in England, then returned to the front, where he was eventually shot down over Belgium and killed in December 1917. But there's more to his story. "For a brief time in 1916 he was probably the most famous pilot in the world," says Broad. "He was credited with downing Oswald Boelcke, the most famous German pilot at the time." Yet, in a letter home, McKay refused to take credit, saying that Boelcke had actually crashed into another German plane. McKay's war records were destroyed during a World War II air bombing on London -- an explanation for why he was all but forgotten. But now, thanks to the efforts of Broad and his students, a marker in McKay's memory was placed on the university grounds in November 2007. "I found my eyes filling with tears... Question: What did the students find out about McKay? - He trained pilots for some time. - He lived longer than other pilots. - He died in the Second World War. - He was downed by the pilot Boelcke.
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He trained pilots for some time.

Read the following article and select the best answer. Article: Medical drugs sometimes cause more damage than they cure. One solution to this problem is to put the drugs inside a capsule, protecting them from the body--and the body from them--until they can be released at just the right spot. There are lots of ways to trigger this release, including changing temperature, acidity, and so on. But triggers can come with their own risks--burns, for example. Now, researchers in California have designed what could be a harmless trigger to date: shining near-infrared light (NIR, ) on the drug in the capsule. The idea of using light to liberate the drug in the capsule isn't new. Researchers around the globe have developed polymers and other materials that begin to break down when they absorb either ultraviolet (UV, ) or visible light. But tissues also readily absorb UV and visible light, which means the drug release can be triggered only near the skin, where the light can reach the capsule. NIR light largely passes through tissues, so researchers have tried to use it as a trigger. But few compounds absorb NIR well and go through chemical changes. That changed last year when Adah Almutairi, a chemist at the University of California, San Diego, reported that she and her colleagues had designed a polymer that breaks down when it absorbs NIR light. Their polymer used a commercially available NIR-absorbing group called o-nitrobenzyl (ONB). When they catch the light, ONB groups fall off the polymer, leading to its breakdown. But ONB is only a so-so NIR absorber, and it could be poisonous to cells when it separates from the polymer. So Almutairi and her colleagues reported creating a new material for capsules that's even better.This one consists of a long chain of compounds called cresol groups linked in a polymer. Cresol contains reactive components that make it highly unstable in its polymeric form, a feature Almutairi and her colleagues use to their advantage. After polymerizing the cresols, they cap each reactive component with a light-absorbing compound called Bhc. When the... Question: Which word can be used to complete the following process of changes? - protected - formed - exposed - combined
exposed