More recent tests of the predictive content in Value Line rankings.（）

A. provide additional support for the semi-p form of the EMH.

B. provide less support for the semi-p form of the EMH.

C. provide additional support for the weak form of the EMH.

贾思勰在《齐民要术》一书中认为，“耕而不耢(平整土地)，不如做暴。”这主要是强调农业生产(　　)

A．必须讲究耕作方法

B．应当抓住农时

C．需要改革生产工具

D．如何选种播种