Chemistry is the study of the behavior and composition of matter.All foods

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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. [br] 【M9】

选项

答案 know cleansing中间加about

解析 know意为“熟悉”，强调的是对某事非常了解，而know about意为“知道”，但没有深入的研究。该句话是建议家庭工作者对家用清洁剂和纺织品有一定的了解，有些许知识即可，故在know后加about。

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Chemistry is the study of the behavior and composition of matter.All foods

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