填空题
. Chemistry is the study of the behavior and composition of matter. All foods are
made up of chemical substance which undergoes chemical changes when cooking
1 in an oven or digested within the body. The cooking of meat and vegetables induce
2 chemical changes, making it more delicious; similarly the leavening action of
3 baking 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.
4 This is evident from the variety of cooking products and food additives available
as cooking oils, fats, colorings, sweeteners, tenderizers, flavorings, screaming
agents, preservatives, etc. Each is carefully prepared before painstaking research.
5 It is therefore essential for trained cookers to understand
6 chemical science in order to appreciate the chemistry nature of foods
7 and the changes achieving on cooking. Homeworkers should als0
8 know cleansing agents and textiles used in the home and how the latter
9 responds to the effects of heat, light, water, and chemical cleansing
10 agents.