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Look closely at your hands. Are they clean? It doesn't matter how many times you wash your hands, tiny microbes (微生物) still stay on them. But don't worry. Most microbes don't harm you.

Now scientists say the microbes on our hands coul d be used in a surprising way; fighting crime, According to a recent survey microbes as well as fingerprints(指纹) could be used to indentify the criminal.

Everyone has his own set of microbes on the hands. That is to say, if you and your best friend were able to see and compare all the microbes on your hands, your hands probably would look different. Some microbes only show up on your hands while others live only on your friend's hands.

When you work on a computer you leave the microbes from your hands on the keyboard. The scientists can easily tell the owner of the keyboard by looking at the microbes on it. Even if you don't leave your fingerprints behind, your microbes may give you away.

Noah Fierer, a scientist, says. "You can only clean a fingerprint, but you can't sterilize (使无菌) a surface ju st by wiping(擦) it off," He says that scientists have a lot more work to do before the microbe is used as a useful tool.

46. According to the passage,_______ could be used to identify the criminal.

A. fingerprints B. scientists' hands

C. microbes D. fingerprints and microbes on people's hands

47. Paragraph 3 tells us that________.

A. our hands look similar B. the microbes will make the keyboard dirty.

C. we should compare hands often D. we have our own sets of microbes.

48. When you work on computer, the microbes________.

A. just stay on our hands B. also stay on the keyboard

C. will do harm to you D. will disappear

49. From Noah Fierer we know that________.

A. fingerprints are no longer useful in fighting crime

B. microbes can be found on everyone's hands.

C. unlike microbe fingerprints can be cleaned if people wipe them

D. the microbe is used as a useful tool

50. What’s the best title of the passage?

A. Microbes May Tell Who You Are B. Scientists Say Everyone Has Microbes

C. Noah Fiercer Does Research Into Microbes D. Fingerprints Help Catch Cri minals

主旨大意：文章介绍了手上的细菌也可以用来辨别人。

46. D 【解析】细节理解题。根据文章第一段的最后一句“According to a recent survey microbes as well as fingerprints(指纹) could be used to indentify the criminal.”可知正确答案是D。

47. D【解析】细节理解题。根据第一段的第三句“This first came out of a restaurant in Singapor e, but it is now very popular as the soup du jour in Chinese restaurants. ”可知正确答案是A。

48. B【解析】推断理解题。根据第一段的第三句“Everyone has his own set of microbes on the hands.”正确答案是B。 49. C【解析】细节理解题。根据“You can only clean a fingerprint, but you can't sterilize (使无菌) a surface just by wiping(擦) it off,”。正确答案是C。

50. C【解析】主旨理解题。通读全文可知Noah Fiercer在研究细菌。正确答案是C。

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