69. 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 237 people.

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

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

　　70. 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

　　71. The passage is mainly about

　　.

　　A. the importance of fingerprints B. how to clean our hands

　　C. different germs on our hands D. the usefulness of microbes

　　E

　　Increasingly, Americans are becoming their own doctors, by going online to diagnose their symptoms, order home health tests or medical devices, or even self-treat their illnesses with drugs from Internet pharmacies(药店).Some avoid doctors because of the high cost of medical care, especially if they lack health insurance. Or they may stay because they find it embarrassing to discuss their weight, alcohol consumption or couch potato habits. Patients may a1so fear what they might learn about their health, or they distrust physicians because of negative experiences in the past.

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