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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 undergoe

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

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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          【M1】________
    in an oven or digested within the body. The cooking of meat and vegetables induce    【M2】________
    chemical changes, making it more delicious; similarly the leavening action of        【M3】________
    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.                             【M4】________
    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.  【M5】________
    It is therefore essential for trained cookers to understand                          【M6】________
    chemical science in order to appreciate the chemistry nature of foods                【M7】________
    and the changes achieving on cooking. Homeworkers should also                        【M8】________
    know cleansing agents and textiles used in the home and how the latter               【M9】________
    responds to the effects of heat, light, water, and chemical cleansing                【M10】________
    agents.
【M5】
选项
答案before→affer
解析 根据生活常识，烹饪食材的添加，应该是在研究之后才确定使用。所以将before改为after。
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本试题收录于： A类竞赛（研究生）题库大学生英语竞赛（NECCS）分类
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