My cousin keeps the photo ____ he can see it every day, as it always reminds him of his college days in Florida.

A．which

B．where

C．whether

D．when

水土流失生物措施的实施中，最为关键的是土地整治和表层土壤的覆盖问题。土地整治包括（）整治。

A.取土场和弃渣场

B.边坡绿化土地

C.各种非永久占地

D.工程永久占地区的土地