上海复旦大学学生顾某，毕业时主动放弃“白领”工作回到农村，结合所学知识和当地农业特点，通过网络销售农产品，生意越做越红火。读该地循环农业生产模式图(下图)，该生产模式的农产品深受消费者青睐，主要是因为(    )

下列属于非金属元素的是（　　）

语法填空。

    I'm Lucy．This is a map of our school．____six buildings(楼房)in it．They are a dining hall，an art building，a sports hall，a science building，a classroom building and a library．Our classroom building is ____the science building．And it's ____ the library．In the middle of our school,____a big playground(操场)．We often play sports on it．Next to the playground is the art building．It's____the dining hall and the sports hall．Our school is big，and it's nice．