下列诗词鉴赏无误的一项是（    ）

若二次根式$\sqrt{x-3}$在实数范围内有意义，则x的取值范围是____.

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．