题目

人体内胃酸的主要成分是盐酸，胃酸过多，会引起一系列胃病。最近，美国食品与药品管理局批准胃酸完全抑制剂(Pepcid Complete)上市，作为治疗胃酸分泌过多的药品。该药品的标签如图Z7－14所示。 图Z7－14 试通过计算说明，患者按处方服用该药一天，理论上可消耗HCl多少毫克？ 答案：．解：设与碳酸钙反应的HCl的质量为x，与氢氧化镁反应的HCl的质量为y。 CaCO3 ＋ 2HCl===CaCl2＋H2O＋CO2↑ 100         73 2×800 mg    x ＝ x＝1168 mg Mg(OH)2＋2HCl===MgCl2＋2H2O 58         73 2×116 mg  y y＝292 mg 碳酸钙和氢氧化镁消耗的HCl的总质量为1168 mg＋292 mg＝1460 mg。 答：患者按处方服用该药一天，理论LONDON(Reuters)—Organic fruit, delivered right to the doorstep. That is what Gabriel Gold prefers, and he is willing to pay for it. If this is not possible, the 26-year old computer technician will spend the extra money at the supermarket to buy organic food. “Organic produce is always better. ”Gold said. “The food is free of pesticides(农药), and you are generally supporting family farms instead of large farms. And more often than that it is locally(本地)grown and seasonal, so it is more tasty. ” Gold is one of the growing number of shoppers buying into the organic trend, and supermarkets across Britain are counting on more like him as they grow their organic food business. But how many shoppers really know what they are getting, and why are they willing to pay a higher price for organic produce? Market research shows that Gold and others who buy organic food can generally give clear reasons for their preferences—but their knowledge of organic food is far from complete. For example, amounts of pesticides can be used on organic products. And about three quarters of organic food in Britain is not local but imported(进口)to meet growing demand. “The demand for organic food is increasing by about one third every year, so it is a very fast-growing market, ”said Sue Hock, a specialist in this line of business. 1. More and more people in Britain are buying organic food because________________. A. they are getting richer B. they can get the food anywhere C. they consider the food free of pollution D. they like home-grown fruit 2. Which of the following statements is true to the facts about most organic produce sold in Britain? A. It grows indoors all year round. B. It is produced outside Britain. C. It is grown on family farms. D. It is produced on large farms. 3. What is the meaning of “the organic trend” as the words are used in the text? A. Growing interesting in organic food. B. Better quality of organic food. C. Rising market for organic food. D. Higher prices of organic food. 4. What is the best title for this news story? A. Organic Food—Healthy, or Just for the Wealthy? B. The Making of Organic Food in Britain. C. Organic Food—to Import or Not? D. Good Qualities of Organic Food.