問題補(bǔ)充：
單選題
Meat is an ideal food for humans, and for mold(霉) and bacteria as well. When itis fresh, it is one of the best culture mediums. It consists of 20 percentprotein(蛋白質(zhì)), fats, mineral matter and organic(有機(jī)的) compounds. The best of it is water. This combination ofmoisture(濕氣) and solids makes it one of the most perishable(易腐敗) of foods. Thebacteria produce discoloration and bad odors. The odor fills the meatwith black spots and other discolorations.The best title is ________.注:odor氣味(smell) discoloration 變色的部分，污點A.Spoilage of meatB.Meat and moldsC.Ideal food for humanD.Fresh meat
