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      An air pollutant is defined as a compound added directly or indirectly by humans to the atmosphere in such quantities as to affect humans, animals, vegetation, or materials adversely. Air pollution requires a very flexible definition that permits continuous change. When the first air pollution laws were established inEngland in the fourteenth century, air pollutants were limited to compounds that could be seen or smelled - a far cry from the extensive list of harmful substances known today. As technology has developed and knowledge of the health aspects of various chemicals has increased, the list of air pollutants has lengthened. In the future, even water vapor might be considered an air pollutant under certain conditions.

      Many of the more important air pollutants, such as sulfur oxides, carbon monoxide, and nitrogen oxides, are found in nature. As the Earth developed, the concentration of these pollutants was altered by various chemical reactions; they became components in biogeochemical cycles. These serve as an air purification scheme by allowing the compounds to move from the air to the water or soil. On a global basis, nature's output of these compounds dwarfs that resulting from human activities.

      However, human production usually occurs in a localized area, such as a city. In such a region, human output may be dominant and may temporarily overload the natural purification scheme of the cycles. The result is an increased concentration of noxious chemicals in the air. The concentrations at which the adverse effects appear will be greater than the concentrations that the pollutants would have in the absence of human activities. The actual concentration need not be large for a substance to be a pollutant; in fact, the numerical value tells us little until we know how much of an increase this represents over the concentration that would occur naturally in the area. For example, sulfur dioxide has detectable health effects at 0.08 parts per million (ppm), which is about 400 times its natural level. Carbon monoxide, however, has a natural level of 0.1 ppm and is not usually a pollutant until its level reaches about 15 ppm.

According to the passage, human-generated air pollution in localized regions _______.

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I ______ work last week, but I changed my mind

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_______ imaginative stories about the origin of the game of chess.

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Oil shale is a soft, fine-grained sedimentary rock _______ oil and natural gas are obtained.

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The term “art deco” has come to encompass three distinct but related design trends of the 1920’s and 1930’s. The first was what is frequently referred to as “zigzag moderne” – the exotically ornamental style of such skyscrapers as the Chrysler Building in New York City and related structures such as the Paramount Theater in Oakland, California. The word “zigzag” alludes to the geometric and stylized ornamentation of zigzags, angular patterns, abstracted plant and animal motifs, sunbursts, astrological imagery, formalized fountains, and related themes that were applied in mosaic relief and mural form to the exterior and interior of the buildings. Many of these buildings were shaped in the ziggurat form, a design resembling an ancient Mesopotamian temple tower that recedes in progressively smaller stages to the summit, creating a staircase-like effect.

            The second manifestation of art deco was the 1930’s “streamlined moderne” style—a Futuristic-looking aerodynamic style of rounded corners and horizontal bands known as “speed stripes.” In architecture, these elements were frequently accompanied by round windows, extensive use of glass block, and flat rooftops.

            The third style, referred to as “international stripped classicism” also came to the forefront during the Depression, a period of severe economic difficult in the 1930’s. This was a more conservative style, blending a simplified modernistic style with a more austere form of geometric and stylized relief sculpture and other ornament, including interior murals. May buildings in this style were erected nationwide through government programs during the Depression .

            Although art deco in its many forms was largely perceived as thoroughly modern, it was strongly influenced by the decorative arts movements that immediately preceded it. For example, like “art nouveau” (1890-1910), art deco also used plant motifs, but regularized the forms into abstracted repetitive patterns rather than presenting them as flowing, asymmetrical foliage, Like the Viennese craftspeople of the Wiener Werkstatte, art deco designers worked with exotic materials, geometricized shapes, and colorfully ornate patterns. Furthermore, like the artisans of the Arts and Crafts Movement inEnglandand theUnited States, art deep practitioners considered it their mission to transform the domestic environment through well-designed furniture and household accessories.

According to the passage, which of the following statements most accurately describes the relationship between art deco and art nouveau?

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I never read ________ newspapers during the week, but I buy ______Observer every Sunday  and I read it in ________bed.

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Where is he? He should __________ at home hours ago

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Now that Susan has moved to the country, her visits to see in the city are________

Choose the option among A, B, C, D which needs correcting to make a complete sentence

(A) After writing it, the essay must (B) be duplicated by the student himself and handed (C) into the department secretary before the end of the month.

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“What’s the matter? You don’t look very well.”   – “I feel a little _____________.”

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The government was finally ______ by a minor scandal.

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The term “art deco” has come to encompass three distinct but related design trends of the 1920’s and 1930’s. The first was what is frequently referred to as “zigzag moderne” – the exotically ornamental style of such skyscrapers as the Chrysler Building in New York City and related structures such as the Paramount Theater in Oakland, California. The word “zigzag” alludes to the geometric and stylized ornamentation of zigzags, angular patterns, abstracted plant and animal motifs, sunbursts, astrological imagery, formalized fountains, and related themes that were applied in mosaic relief and mural form to the exterior and interior of the buildings. Many of these buildings were shaped in the ziggurat form, a design resembling an ancient Mesopotamian temple tower that recedes in progressively smaller stages to the summit, creating a staircase-like effect.

            The second manifestation of art deco was the 1930’s “streamlined moderne” style—a Futuristic-looking aerodynamic style of rounded corners and horizontal bands known as “speed stripes.” In architecture, these elements were frequently accompanied by round windows, extensive use of glass block, and flat rooftops.

            The third style, referred to as “international stripped classicism” also came to the forefront during the Depression, a period of severe economic difficult in the 1930’s. This was a more conservative style, blending a simplified modernistic style with a more austere form of geometric and stylized relief sculpture and other ornament, including interior murals. May buildings in this style were erected nationwide through government programs during the Depression .

            Although art deco in its many forms was largely perceived as thoroughly modern, it was strongly influenced by the decorative arts movements that immediately preceded it. For example, like “art nouveau” (1890-1910), art deco also used plant motifs, but regularized the forms into abstracted repetitive patterns rather than presenting them as flowing, asymmetrical foliage, Like the Viennese craftspeople of the Wiener Werkstatte, art deco designers worked with exotic materials, geometricized shapes, and colorfully ornate patterns. Furthermore, like the artisans of the Arts and Crafts Movement inEnglandand theUnited States, art deep practitioners considered it their mission to transform the domestic environment through well-designed furniture and household accessories.

According to the passage, which of the following design trends is known by more than one name ?

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Never before _______ such a wonderful child

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Anna is holding her shopping bag with one hand and turning the door handle   with ______.

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In a formal interview, it is essential to maintain good eye _______ with the interviewers.

Choose the option among A, B, C, D which needs correcting to make a complete sentence

Abraham Lincoln's (A) boyhood home resembled (B) that of many other mid-western pioneers with its (C) dirt floor, sleeping loft, and (D) crude fireplace.