2.D。细节题。根据第四段“Agricultural products are more expensive than previous years, and this directly lead to the price increase of nianyefan.”可知年夜饭涨价主要是因为成本高了。
3.B。细节题。根据第六段“...most families in the city now prefer to head out to a restaurant...”可知现在越来越多的家庭选择在餐馆吃年夜饭。
4.C。推理判断题。根据倒数第二段“They sometimes refused to return the customers deposit if they...”可知订做年夜饭顾客是需要先预交定金的。