YDS İngilizce Paragraph Completion Testi 1

Many people assume that the Great Wall of China is a single continuous structure. ---- These sections were constructed by different dynasties over many centuries, using materials ranging from earth to stone and brick.

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Glass frogs, found in the rainforests of Central and South America, get their name from their transparent skin. ---- Scientists recently discovered that, when the frogs sleep, they hide most of their red blood cells in their liver, making their bodies even more see-through.

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Before the invention of refrigerators, people used a variety of methods to keep food fresh. Meat and fish were often salted or smoked, while fruit was dried in the sun. ---- Ice cut from frozen lakes in winter was stored in these buildings, often insulated with straw or sawdust, and could last well into the summer.

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Fingerprints form before birth, while a baby is still developing in the womb. ---- Even identical twins, who share the same DNA, have different fingerprints. This is why fingerprints have long been used to identify individuals.

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---- For example, a person who believes that left-handed people are more creative will tend to notice creative left-handers and overlook those who are not. Over time, this selective attention makes the belief seem stronger than the evidence really supports.

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Venice is built on more than a hundred small islands in a lagoon. ---- Over the centuries, however, these wooden supports have hardened rather than rotted, because they are surrounded by water and mud that contain very little oxygen.

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Many people think of boredom as an entirely negative feeling. ---- When we are bored, our minds tend to wander, and this daydreaming can lead to unexpected connections between ideas. Some psychologists even recommend allowing children to be bored occasionally rather than filling every minute of their day with activities.

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The Rosetta Stone, discovered in Egypt in 1799, carries the same text written in three different scripts. ---- Since scholars could already read the last of these, they were able to use it as a key to decipher the hieroglyphs. Jean-François Champollion announced his breakthrough in 1822.

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Most of us have experienced the frustration of forgetting why we walked into a room. ---- According to this view, passing through a doorway signals to the brain that one episode has ended and a new one has begun, so details from the previous room become harder to recall.

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Some animals use tools in surprisingly clever ways. Sea otters, for instance, float on their backs and use stones to break open shellfish. ---- Researchers have watched them pull leaves off twigs and then push the twigs into holes to catch insects.

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The QWERTY keyboard layout was designed in the 1870s for mechanical typewriters. ---- One popular explanation is that the layout separated commonly used letter pairs so that the metal arms of the typewriter would not jam. Although typewriters have largely disappeared, the layout has survived because so many people have already learnt to type on it.

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In many cultures, it is considered rude to refuse food offered by a host. ---- In some parts of the world, however, finishing everything on your plate suggests that the host has not provided enough, so guests deliberately leave a small amount uneaten.

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Light pollution is not only a problem for astronomers. ---- Baby sea turtles, for example, find their way to the ocean by moving towards the brightest horizon, which is normally the moonlit sea. Bright lights from nearby hotels and roads can lead them inland instead, where many die.

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---- Instead, they often focus on one small skill at a time, repeating it until they can perform it perfectly, and they actively seek feedback on their mistakes. This kind of focused, uncomfortable practice is what distinguishes experts from people who simply have years of experience.

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Tardigrades, also known as water bears, are tiny animals less than a millimetre long. ---- In this state, they can survive extreme cold, intense radiation and even the vacuum of space. When conditions improve, they rehydrate and return to normal life.

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Stepwells are a type of structure found mainly in India. ---- Some of them reach many storeys below ground and are decorated with detailed stone carvings. Besides providing water, they offered a cool place for people to rest during the hottest months.

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For centuries, sailors relied on the stars to navigate across open seas. ---- Unless they knew the exact time, they could not determine how far east or west they had travelled. This problem was solved in the eighteenth century when John Harrison built a clock accurate enough to keep time at sea.

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Many people believe that goldfish have a memory span of only a few seconds. ---- In experiments, goldfish have been trained to push levers for food and to respond to sounds signalling feeding time, and they have remembered these lessons for months.

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Some hospitals have introduced therapy dogs that regularly visit patients. ---- Staff have also noticed that patients become more willing to talk and take part in their treatment after these visits. Nevertheless, hospitals must take precautions to ensure that the animals do not spread infections.

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The Mediterranean diet is based on the traditional eating habits of countries such as Greece and Italy. ---- Meat, especially red meat, is eaten only occasionally. Many nutritionists recommend this diet because it is associated with a lower risk of heart disease.

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