阅读短文, 根据其内容, 选择恰当的句子补全短文，使其意思完整、通顺。 Have you ever been ill? When you are ill, you must be unhappy because your body becomes hot, and there are pains all over your body. 46 you stay in bed, feeling very sad. What makes us ill. It is germs(细菌). 47 They are very small and you can’t find them with your eyes, but you can see them with a microscope(显微镜). They are very very small and there could be hundreds of them on a very small thing. 48 _When we look at dirty water under the microscope, we shall see them in it. So your father and mother will not let you drink dirty water. 49 They are found in air and dust(灰尘). If you cut your finger, if some of the dust from the floor goes into the cut (伤口) , 50 Your finger would become big and red, and you will have much pain in it. Sometimes the germs would go into all of your body, and you would have pain everywhere.
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