题目内容：

阅读下面短文，从方框内选择恰当的句子填入文中空白处，使短文内容完整、意思连贯。

Have you ever been ill? When you are ill, you must be unhappy because your body becomes hot, 1.. You don’t want to work. You stay in bed, feeling very sad.

What makes us ill? It is germs(细菌). Germs are everywhere. They are very small and you can’t find them with your eyes,   2. . They are very small and there could be hundreds of them on a very small thing.

Germs are always found in dirty water. When we look at dirty water under the microscope, we shall see them in it.   3. .

Germs are not only found in water. 4. . If you cut your finger and some of the dust from the floor goes into the cut(伤口),  5. . Your finger would become big and red, and you would have pains everywhere.

A. They are also found in air and dust(灰尘) B. and there are pains all over your body C. but you can see them with a microscope(显微镜) D. So we remember not to drink dirty water E. some of the germs would go into your finger F. You can also find them in dirty water.