1、（2011·广西桂林市、防城港市南京考越高三第一次联合调研考试）
In the rush to get to school, you drop a piece of coast on the floor. Do you throw it away or decide it’s still OK to et? If you’re like most people, you eat it. maybe you follow the “5-second rule”, which claims foods are safe to eat if you pick them up within 5 seconds after dropping them. but you might want to think again. Scientists now say that 5 encodes is all it takes for foods to become polluted with enough bacteria（细菌）to make you sick.
Bacteria can cause many kinds of illnesses. Some kinds of bacteria can grow on food. If you eat foods on which these bacteria are growing, you can become sick.
