在清点受损财产时，保险公估从业人员和保险当事人均有（）义务。

A.保证受损财产得到妥善保护

B.如实出具相关证明

C.向保险人提出索赔

D.客观反映财产受损程度

As is known to all, the newly learnt words will soon be forgotten unless_____ used in everyday communication.

A．gradually

B．accurately

C．familiarly

D．frequently