我国政府向内陆、高原山区推广食用碘盐，目的是为了减少什么病的发生（　　）

单细胞生物草履虫用____呼吸，在____内进行消化吸收营养。

根据短文内容，完成任务。

    Sally is an English girl. She is my English teacher, Mrs Brown's daughter. She is only five years old. She doesn't go to school. She likes playing ping-pong. Her favorite ping-pong player is Zhang Yining. Sally is in the ping-pong club. She goes to the ping-pong club every day. She plays ping-pong for two hours there. Sally has a sister. Her name is Maria. She is in our class. She likes singing. (A) She wants to join the music club, she sings every morning. (B)Her favorite singing star is Song Zuying. Maria says she wants to be a singing star like Song Zuying.