Read the following article and select the best answer. Article: Vitamins are complex chemical substances found in many foods. The human body needs them for health and growth. The body makes some vitamins, but usually in amounts too small to meet its needs. Other vitamins are not made in the body. These must be supplied. No one knows exactly how all vitamins work. Doctors do know that vitamins have very special uses. One vitamin therefore cannot take the place of another. The steady absence of one vitamin in an otherwise complete diet causes a deficiency disease. Rickets, scurvy, and pellagra are examples of deficiency diseases. It is best to obtain vitamins by eating the foods in which they occur. There are also pills that contain a single vitamin or a combination of vitamins people should consult their doctors before they take any vitamin pills. Scientists have discovered about 25 vitamins and their different forms that are very important to human beings and other forms of life. Experts believe that there are many more vitamins to be discovered. There are two basic groups of vitamins. One group of vitamins dissolves in fat and is therefore called the "fat-soluble" group. Vitamins A, D, E and K are in this group. The other group is known as "water-soluble" vitamins. These vitamins, understandably, dissolve in water. Among this group are Vitamin C and the B group of vitamins. Vitamin A aids the building and growth of body cells. This vitamin is therefore vital for the growth of children and for good development of babies before birth. Vitamin A is also important for good vision at night. Vitamin B1 is also called thiamine. This vitamin prevents and cures disease. Vitamin B2, called riboflavin, is needed for growth, healthy skin, and for the eyes. Vitamin C, or ascorbic acid, prevents and cures scurvy. Vitamin D is a group of 10 vitamins that prevents rickets. Scientist believe that Vitamin D3 forms in the skin when the body is exposed to sunlight. Because of this, it is called the "sunshine vitamin". A lack of Vitamin D may lead to bone damage; too much may cause kidney... Question: Which of the following statements is true? - The human body can produce enough vitamins for itself. - Until now, scientists have discovered all the vitamins we need. - People should take more vitamins. - Each kind of vitamin plays a special role in human body.
Each kind of vitamin plays a special role in human body.
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Read the following article and select the best answer. Article: Until late April, northern China had experienced eight severe sandstorms this year alone, worsening the air quality in half the region's cities. This year's sandstorms are considered more severe than before. Not only are they increasing in frequency and having more serious effects on air quality, but they are also occurring earlier in the season and affecting a wider area. The timing of the first sandstorm moved up by a week this year, and the sandstorm-affected area has extended beyond 3 million square kilometers. The reason for the frequent dust storms is worsening desertification in China's northern areas, caused by a combination of warm, dry weather and the rapid spread of agriculture. The dust-affected area is likely to expand to the northeast in the near future as a large area of grassland in Inner Mongolia's northern plain turns rapidly to desert. Due to its lack of rainfall and overall surface dryness in the spring, Beijing experiences sandstorms every March and April. The most recent sandstorm hit the capital on April 17 and was the worst in five years. For about 40 days every year, the pollutants cannot be diffused, as the city's location makes it a natural container for accumulating sand and dust. Rapid urban development is affecting Beijing's air quality as well. To _ the dust from hundreds of new construction sites, authorities have issued rules asking builders to cover all working areas, pack down loose dirt, and wash vehicle tires when leaving the sites. Question: All of the following are the reasons for desertification in northern China EXCEPT _ - warm and dry weather - the rapid increase of agriculture. - the disappearance of grassland - the frequent dust storms
the frequent dust storms
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Read the following article and select the best answer. Article: Not everyone in the world requires the same amount of living space. The amount of space a person needs around him is a cultural difference, not an economic one. Knowing your own psychological space needs is important because they strongly affect your choices, including, for example, the number of bedrooms in the home. If you were brought up in a two-child family and both you and your sister or brother had your own bedrooms, the chances are, if you have two children or more, that you also will offer separate bedrooms for them. In America, for example, they train people to want to have their own rooms by giving them their own rooms when they are babies. This is very rare in the world. In many other countries, the baby sleeps in the same bed with his parents or in bed near them. The space in the home also shows a lot about psychological space needs. Some families gather closer to each other and the size of their house has nothing to do with it. Others have separate little corners where family members go to bed alone. Although it is true that psychological space needs are not decided by economic reasons, they sometimes have to be changed a little because of economic pressures. It is almost impossible, however, to completely change your psychological space needs. Question: The best title for this passage is _ . - American Way of Living - Psychological Space - Space Needs in Different Countries - Psychological Space and Economic Pressure
Psychological Space
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Read the following article and select the best answer. Article: Steve Fossett did not really look like an adventurer, but he reached some of the most difficult goals in sailing and flying. Fossett was most proud of being the first person to fly around the world alone in a hot-air balloon. To make a trip around the world alone, it was necessary to have an improvedautopilot device. Fossett had one of his team members develop a more advanced balloon autopilot that would allow him to sleep and do other tasks while flying safely. Steve Fossett attempted the hot-air balloon trip around the world six times. This was not easy to do. He flew in the balloon'scapsule that was too small to stand upright. During his fourth attempt in 1998, he was almost killed during a storm off the coast of Australia. He fell 9,000 meters into the Coral Sea with his balloon's capsule on fire. He was later rescued at sea. Fossett successfully made the trip in 2002. The trip started and ended in Australia. He traveled more than 33,000 kilometers for more than 14 days. On this flight, Fossett set other records including a speed record of 322 kilometers per hour. One main problem with earlier balloon flights was the threat of dangerous storms. A team of weather experts e-mailed and talked to Fossett by a satellite telephone to help him avoid such weather. Steve Fossett's hot-air balloon is now at the Smithsonian's National Air and Space Museum in Washington, D.C. It is there as an example for other people to try and succeed in doing something important to them. Question: We can learn from the text that Steve Fossett was _ . - patient and careful - modest and easy-going - brave and determined - energetic and kind-hearted
brave and determined
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