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  3. Chemistry is the study of the behavior and composition of matter. All foods are made up of chemical substance which undergoes

Chemistry is the study of the behavior and composition of matter. All foods are made up of chemical substance which undergoes

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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.
【M1】
选项
答案将cooking改为cooked。
解析 动词cook与主句主语all foods在逻辑上是动宾关系，因此应使用过去分词形式，例如：He assented readily when asked to help．要求他帮助时，他欣然同意了。When presented with a common case，sales managers tend to see sales problems，production managers see production problems and so on．同一种情况摆在面前，销售经理看到的是销售问题，生产经理看到的是生产问题，如此等等。
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