填空题 Proofread the passage as required. Each indicated line contains a maximum of one error. Correct the passage in the following way: for a correct line, put the sign "√" in the corresponding blank; for a wrong word, underline the wrong word and write the correct one in the blank; for a missing word, mark the position of the missing word with the sign "∧" and write the word you believe to be missing in the blank; for an unnecessary word, cross the unnecessary word with the sign "—" and put the word with the sign "—" in the blank. Write the answers on the answer sheet.
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 82. ______
in an oven or digested within the body. The cooking of meat and vegetables induce 83. ______
chemical changes, making it more delicious; similarly the leavening action of 84. ______
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. 85. ______
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 86. ______
research.
It is therefore essential for trained cookers to understand 87. ______
chemical science in order to appreciate the chemistry nature of foods 88. ______
and the changes achieving on cooking. Homeworkers should also 89. ______
know cleansing agents and textiles used in the home and how the latter 90. ______
responds to the effects of heat, light, water, and chemical cleansing agents. 91. ______