证券监督管理机关和证券争议处理机关在履行职责时，如果没有法律依据或法律规定不明，应当依据（）原则解释法律和处理问题。

A.公平

B.公正

C.诚实信用

D.公开

—What does your father look like?

—He ____.[ ]

A. likes history

B. is tall and thin

C. likes eating meat

D. is 40 years old