英语实用写作Lsson 2.doc

In this part you will read several definition paragraphs. After each of the definitions a name of a thing is given followed by some information about it. Write extensive definitions of the given names modeling after the examples. Vitamin is a chemical compound that the human body needs in small amounts. Vitamins make up one of the major groups of nutrients and regulate chemical reactions by which the body coverts food into energy and living tissues. Protein: one of the main classes of foods, essential to animals, obtain from what they eat, be high in protein contents, cheese, eggs, meat, fish, milk, make up a large part of, build, maintain, repair, tissue, bone, muscles Protein is one of the three main classes of food essential to the body of human being and other animals. They obtain proteins from the foods they eat. Foods that are high in protein content include cheese, eggs, fish, meat and milk. All protein contain iron, phosphorus and sulfur. Proteins are large, complex molecules made up of smaller units and they make up a large part of each cell. Therefore, they are important in building, maintaining and repairing body tissues, especially bone cartilage and muscle. Measurement ranks as one of our oldest skills. It is the process of finding out how many measuring units there are in something. These units include inches, meters, pound, grams, and hours. Calculation: a process, add, subtract, multiply, divide, find a result Minute is a unit used to measure both time and angles. In time, 60 minutes make up one hour and each minute is divided into 60 seconds. In measuring angles, 60 minutes make up one degree, and a circle is divided into 360 degrees. Degree: a name given to small units of measure, geometry, maps, measurement of angles, arcs of circles, temperature Degree is a name given to various small units of measure. In geometry and on maps, a degree is a unit of measurement of angles and of arc of circles. An angle of one degree is 1/90 of a right angle. An