Dr. Besser knew E.coli could move from animals to humans. Had the children touched animals that carried the bacteria? Besser found other E. coli cases in the area where the children lived. But (b)it w asn’t enough. Besser went to where the apple juice was made. He saw animals around the apple trees. He also saw the workers using dirty apples that had fallen on the ground. More importantly, he saw that the apples were not washed before the juice was made,and that the juice was not heated. (c)Doing these things would kill the bacteria. Besser then knew it was the apple juice that made the children sick. (b)itと(c)Doing these thingsが具体的に指す内容を日本語で教えてください。