填空题
Chemistry is the study of the behavior and composition of matter. All foods aremade up of chemical substance which undergoes chemical changes when cooking 1in an oven or digested within the body. The cooking of meat and vegetables induce 2chemical changes, making it more delicious: similarly the leavening action of 3baking powder is a straightforward chemical change, as is the conversion of starch into sweet sugars by digestion. Cookery is a science requiring a knowledge of chemistry. 4This is evident from the variety of cooking products and food additives available as cooking oils, fats, colorings, sweeteners, tenderizers, flavorings, screamingagents, preservatives, etc. Each is carefully prepared before painstaking 5research. It is therefore essential for trained cookers to understand 6chemical science in order to appreciate the chemistry nature of foods 7and the changes achieving on cooking. Homeworkers should also 8know cleansing agents and textiles used in the home and how the latter 9responds to the effects of heat, light, water, and chemical cleansing agents. 10