四级冲刺练习阅读（191）_大学英语阅读

　　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

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

　　22. 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

　　23. 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.

　　24. Mr. Common Cold is______.

　　A. a newly-found virus

　　B. a nickname of respect to Dr. Gwaltney

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

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