use forensics such as studying fingerprints to identify the criminal.

　　" Microbe fingerprints are harder to hide," said Noah Fierer, one of the scientists. "You can't sterilize(杀菌) a surface just by wiping it off. "

　　His team compared the bacteria on the hands of 273 people to the bacteria found on each person's computer keyboard. For the study, the keyboards had been used only by the people who were being tested. The study showed that the mix of microbes from each person's hands matched

　　the mix of microbes on that person's keyboard. The scientists were easily able to tell the 273 people apart - just by looking at their keyboards.

　　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.

　　67. According to the passage, microbes on people's hands

　　.

　　A. do more harm than good B. are almost the same

　　C. might help solve crimes D. are easy to get rid of

　　68. The underlined word "forensics" in Paragraph 5 probably refers to

　　.

　　A. a new kind of fingerprint B. the scientific test used by police

　　C. a kind of bacteria in people's hands D. a kind of newly invented keyboard

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