问题：[选择题]

[单项选择] TEXT B Whenever two or more unusual traits or situations are found in the same place, it is tempting to look for more than a coincidental relationship between them. The high Himalayas and the Tibetan plateau certainly have extraordinary physical

A．basedonfirsthandexperience
B．theresultoflifelongstudies
C．derivedfrombooksonly
D．limitedtogeologicalhistory