小儿夏季长期发热不止，兼见烦躁、口渴、无汗、多尿等症，至秋凉不治自愈，其病机是（）。

A.气虚

B.血虚

C.阴虚

D.气郁

E.气阴两虚

The argument that term structure of interest rates is determined by expectations about future interest rates and a yield premium for interest rate risk is most closely associated with the:（）

A. expectations hypothesis.

B. liquidity preference theory.

C. market segmentation theory.