广州大学教师向明去美国纽约大学考察回国后，向该大学物理系Prof.Howell致谢，感谢他在向明逗留纽约的那一周所给予的热情和帮助。
Words for Reference:
美国纽约大学: State University of New York
物理系: Physics Department
殷勤招待: hospitality

A. he gave up his belief in the moral idea of the hare-and-tortoise story
B. he gave up arguing with Tony
C. he gave up Tony as a hopeless child
D. he gave up trying to keep up with the new generation