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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.
【M3】
选项
答案将it改为them
解析 因为其先行词为复数名词短语"the meat and vegetables"。
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