Although most scientists at the time, the mid-70s, believed colds were spread by virus-laden droplets spread through the air when infected people coughed or sneezed, Gwaltney suspected physical contact might play an important role. Sure enough, of the 15 people who had touched a student volunteer, 11 became infectedcompared with only one of those who had been sitting at the table, and none who had spent three days and nights together.

　　The best evidence we have is that hand-to-hand contact is the most efficient way of transmitting virus, says Gwaltney. The study was one of a series that helped establish Gwaltneys reputation as a leading authority.

　　Dr. Robert Couch says, It would not be inappropriate to call him Mr. Common Cold.

　　When Gwaltney is asked how close scientists are to finding a cure, he replies: If you mean eradication , I dont think were going to be able to do that with cold viruses any time soon. But if you look in the dictionary, youll see that cure is defined as a successful treatment. And were not just getting more effective at treating the symptoms were getting at the root cause too.

　　21. Dr. Jack M. Gwaltney conducted the experiment in order to______.

　　A. find out the most common cause of colds

　　B. infect the student volunteer

　　C. find out the role physical.contact plays in the common colds

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