ARTICLES Exercise (Answers)
X Sugar is one of the most important plant products. The word sugar applies to more than 100 distinctive substances, each with a scientific name. The sugar most commonly obtained from X plants is X sucrose. When it has been refined, X sugar is colorless and odorless. However, X sugar obtained from the sap of the maple tree tastes different from the sugar derived from the juice of the sugar beet. X Impurities account for the difference in the taste of the two forms of X sugar. X Sugar is produced in X Europe, X Asia, X Africa, X Australia, and X America. The sugar which comes from X Cuba is largely X cane sugar. The sugar from the most western part of the United States is largely X beet sugar.
X Water is a necessity for sustaining X life in X plants and animals. X Men have always been interested in the nature of X water. At one time, X water was considered to be an element. Most water is derived from the ocean directly or indirectly. The water which X New Yorkers use does not come from the Hudson River. The water used in X New York homes comes from X large reservoirs. The water in these reservoirs is purified. However, X absolutely pure water is probably unknown. X Lake water is relatively pure, especially in X mountainous regions. X Most people think X spring water is pure. However, the water which comes from X springs sometimes contains X large amounts of two types of X salt. Therefore, the water in your springs should be analyzed.
X Dust is a great inconvenience to X housewives. It is a difficult problem. X Dust causes a housewife X hours and X hours of X housework a week. To make X things worse, X dust always seems to settle in the most inconceivable places. The dust which comes from X chimneys seems to spread everywhere. X Coal dust is one of the worst types of X dust to wipe up. In the neighborhood where we live, the dust from the Ajax Factory in the next block causes us X trouble. The edges of our windows are covered with X dust in less than a day. The dust on the surface of the tables in our apartment is not quite so difficult to remove. I know the characteristics of X dust very well because my wife frequently asks me to wipe up the dust on the desks and X bookcases in our apartment.
Source: Taylor, Grant
(1956). Mastering American English. New York: McGraw-Hill.