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4.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.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,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.
Germs are always found in dirty water.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.
Germs aren't found only in water.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,some of the germs would go into your finger.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 every where.

72.Are germs only in dirty water?No.They are everywhere around us
73.Why can't we see germs with our eyes?They are too small
74.Why don't your parents let you drink dirty water?There must be lots of germs in it
75.There aren't any germs on your finger if it isn't cut,are there?Yes,thereare
76.What does the passage mainly tell us?Germs may make us ill.

分析 本文讲述了我们生病是因为细菌.细菌在我们身边无处不在.我们只有通过显微镜才能发现它们.它们在水里,空气里,可以通过伤口和其他途径进入我们身体使我们生病.

解答 17.No.They are everywhere around us.细节理解题.根据Germs are everywhere可知细菌无处不在,故答案为:No.They are everywhere around us.
18.They are too small.细节理解题.根据They are very small and you can't find them with your eyes可知因为他们非常小所以看不见,故答案为:They are too small.
19.There must be lots of germs in it.细节理解题.根据Germs are always found in dirty water可知脏水里有许多细菌,所以不能喝脏水,故答案为:There must be lots of germs in it.
20.Yes,there are.细节理解题.根据Germs are everywhere.They are very small and you can't find them with your eyes可知细菌无处不在,它们很小,你用眼睛找不到它们,即使如果不你割伤手指,手上也会有细菌.故答案为:Yes,there are,不,会有的.
21.Germs may make us ill.主旨大意题.根据What makes us ill?It is germs (细菌).可知文讲述了我们生病是因为细菌,故答案为:Germs may make us ill.

点评 做题时首先要仔细阅读短文,掌握大意,然后结合具体的题目,找出相关信息,就可以确定正确答案.

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