填空题
A. Only two. B. Because of a heavy fog. C. 7:30 pm. D. The great favorite of mine. E. No problem. F. Two hours ago. G. Enjoy yourself. H. No. Thank you just the same.
A.To test the relationship between daylight and a disease of the glands common to birds. B.To test the relationship between daylight and migration. C.To test the relationship between migration and temperature. D.To test the relationship between daylight and changes in the season.