根据句意及首字母补全在本课中出现的单词。

   1.Students like to wear j_______ this year.

    2.We don't go to school on w_______.

    3.The ball is r_____.

    4.This sweater is made of c______.

    5.The girl always keeps her room t______ and clean.

    6.There are twelve months in a y_________.

企业行政管理部门为组织和管理开发经营活动而发生的经营费用、管理费用和财务费用为（ ）

A．经营成本

B．开发产品成本

C．期间费用

D．开发项目总投资