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  3. Chemistry is the study of the behavior andcomposition of matter. All foods a

Chemistry is the study of the behavior andcomposition of matter. All foods a

游客2024-12-17  40
问题    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 in an oven or digested         【1】______
within  the body.  The cooking of meat and                     
vegetables  induce  chemical  changes,  making      【2】______
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 for knowledge     【4】______
of chemistry. 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              【5】______
painstaking research.                                       
   It is therefore essential for trained cookers to 【6】______
understand chemical science in order to appreciate                    
the chemistry nature of foods and the changes       【7】______
achieving on cooking. Homeworkers should also       【8】______
know cleansing agents and textiles used in the      【9】______
home and how the latter responds to the effects     【10】______
of heat, light, water, and chemical cleansing agents. [br] 【M4】
选项
答案 将for省略掉。
解析 因为require是及物动词，例如：“Yes”，and“No”are the oldest and simplest words，but they require the most thought．“是”和“否”是最古老、最简单的字，可是它们需要最多的思考。To profit from good ad- vice requires more wisdom than to give it采纳好的忠告比提出好的忠告更加需要智慧。
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