D. a method to cure colds
25. 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
21. C 22. B 23. C 24. B 25. D
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