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阅读下列短文，然后从A、B、C、D四个选项中选出能回答所提问题或完成所给句子的最佳选项。

Have you ever been ill? When you are ill, your body becomes hot, and there are pains all over your body. You must be unhappy because of it. You don't want to work. You stay in bed feeling sad.

What makes us ill? It's germs. 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 can 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 the air and dust (灰尘). If you cut your finger, and if some of the dust from the floor goes into the cut, some of the germs will go into your finger. Your finger will become big and red, and you will have much pain in it. Sometimes the germs will go into all of your body, and you will have pain everywhere.

（1）The underlined word "germs" (in the 2nd paragraph) probably means _______ in Chinese.

A. 病菌

B. 微生物

C. 脏物

D. 尘埃

（2）If germs go into the cut of the finger, you will feel ______.

A. happy

B. big and red

C. painful

D. strong

（3）Where can germs be found?

A. They can always be found somewhere around us.

B. They can only be found in the air and dust.

C. They can be found everywhere in your body.

D. They can only be found on very small things.

（4）When a person is ill, he feels unhappy because ________.

A. his head hurts seriously

B. his finger becomes big and red

C. his body is full of germs

D. his body becomes hot and hurts

（5）From the passage we know that germs are ________ to us.

A. friendly

B. harmful

C. useful

D. necessary