But there are a lot more than 273 criminals. Other scientists wonder whether the microbe fingerprint can really be that useful.

　　Fierer agrees that scientists have a lot more work to do before the microbe fingerprint will be a useful tool. (320W)

　　5. The underlined word “forensics” in Paragraph 5 probably refers to　.

　　A. a new kind of fingerprint

　　B. the scientific test used by the police

　　C. a kind of bacteria on people’s hands

　　D. a kind of newly invented keyboard

　　6. What did Fierer’ s team find through the study?

　　A. They could tell who had used which computer.

　　B. They found the criminal among the 273 people.

　　C. Computer keyboards couldn’t keep people’s microbe fingerprints.

　　D. People’s hands could be identified by the keyboards they used.

　　7. We learn from the passage that　.

　　A. the microbe fingerprint has been used in many cases

　　B. many scientists think microbe fingerprints useless

　　C. scientists will come to a clear conclusion soon

　　D. your microbes may give you away

　　8. The passage is mainly about　.

　　A. the importance of fingerprints

　　B. how to clean our hands

　　C. different germs on our hands

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