Which of the following tests are NOT used to examine the weak form of the efficient market hypothesis Those that examine:（）

A. whether security returns are independent over time.

B. a security’s return relative to the market return.

C. whether excess returns can be obtained from using mechanical trading rules.

《至真要大论》"诸寒之而热者取之阴"是指（）

A.清热

B.散寒

C.养阴

D.补阳

E.以上均不是