Task 3 Paragraph 2 The United States and Canada will someday join the 95 percent of the world that uses the metric rather than the English system of measurement.No longer will North American schoolchildren have to memorize that there are 12 inches in a foot,3 feet in a yard,512 yards in a rod(竿)，40 rods in a furlong(浪)，and8 furlongs in a mile. Inches will become centimeters,pounds will become kilograms,quarts will become liters,and degrees Fahrenheit will become degrees centigrade(also called Celsius). The English system of measurement has been used in English-speaking countries since about the year 1200.The conversion to the metric system will not be easy, however,and will require enormous amounts of money and time.Proponents of the change argue that it is necessary in order for North American products to compete in world markets with metric products.For example,every piece of machinery in every factory and every office will have to be replaced.Furthermore,every machine and tool that makes,repairs,or supplies another piece of equipment will have to be changed. Not only every nut(螺帽)，bolt(螺钉)，and screw(螺丝钉)，but also every wrench (扳手)，drill(钻头)，and screwdriver(改锥)will have to be replaced,as any auto mechanic who has tried to fix an imported car with a set of American tools realizes. Therefore,although the United States and Canada are committed to "going metric",it will not happen next week or even next year.Because of the magnitude of the problems that metric conversion will involve,the change will have to be gradual and above all,carefully plannedTask 3 Paragraph 2 The United States and Canada will someday join the 95 percent of the world that uses the metric rather than the English system of measurement. No longer will North American schoolchildren have to memorize that there are 12 inches in a foot, 3 feet in a yard, 51/2 yards in a rod（竿）, 40 rods in a furlong（浪）, and 8 furlongs in a mile. Inches will become centimeters, pounds will become kilograms, quarts will become liters, and degrees Fahrenheit will become degrees centigrade (also called Celsius). The English system of measurement has been used in English-speaking countries since about the year 1200. The conversion to the metric system will not be easy, however, and will require enormous amounts of money and time. Proponents of the change argue that it is necessary in order for North American products to compete in world markets with metric products. For example, every piece of machinery in every factory and every office will have to be replaced. Furthermore, every machine and tool that makes, repairs, or supplies another piece of equipment will have to be changed. Not only every nut (螺帽), bolt（螺钉）, and screw（螺丝钉）, but also every wrench （扳手）, drill（钻头）, and screwdriver（改锥）will have to be replaced, as any auto mechanic who has tried to fix an imported car with a set of American tools realizes. Therefore, although the United States and Canada are committed to “going metric”, it will not happen next week or even next year. Because of the magnitude of the problems that metric conversion will involve, the change will have to be gradual and, above all, carefully planned