D. find out the role virus-laden air plays in the infection of colds

　　52. The result of the experiment shows that ___ plays an important role in the infection of colds.

　　A. sneezing at the infected person

　　B. touching the infected person

　　C. sitting together with the infected person D. talking with the infected person

　　53. Which of the following statements is TRUE according to the passage?

　　A. Dr. Gwaltney was sure that hand-to-hand touch is the cause of the common cold.

　　B. Only one of the people who had spent three days and nights together became infected.

　　C. Dr. Gwaltney conducted many an experiment as to the cause of colds.

　　D. Dr. Gwaltney tested altogether 43 volunteers to see how they could develop colds.

　　54. Mr. Common Cold is______.

　　A. a newly-found virus

　　B. a nickname (绰号) of respect to Dr. Gwaltney

　　C. a method to cure colds

　　D. a way by which the other scientists laughed at Dr. Gwaltney

　　55. When Dr. Gwaltney gives a reply in the end of the passage, he means that______.

　　A. they have found the fundamental cause of colds

　　B. they have managed to wipe out the cold viruses

　　C. they have meant to experiment more

　　D. they have made much progress in dealing with colds

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