小丽同学学习了《米饭、淀粉和碘酒的变化》一课后很兴奋,因为她学会了检验食物中是否含有淀粉的方法。王老师用米饭和碘酒做了实验:在食物上滴一两滴碘酒,如果变成蓝色就说明食物中含淀粉。其原理是碘酒中含有碘,淀粉能和碘反应产生不同于食物的蓝色物质。小丽回到家中,想学王老师的做法检验家中的食物中是否含有淀粉,但是家中没有碘酒,怎么办?这 After learning a lesson about “Changes in Rice, Starch, and Iodine,” Mary’s students were very excited after class because she learned how to test whether foods contain starch. Wang made experiments with rice and iodine: drop one or two drops of iodine into the food, and if it turns blue, it shows starch in the food. The principle is iodine contains iodine, starch and iodine can produce different from the blue substance of food. Mary returned home, would like to learn the practice of Wang test whether the food in the house contains starch, but there is no iodine at home, how to do?