根据下列短文，选择最佳选项。

    Sam likes soccer. He always watches soccer games on TV. His wife (妻子) Nina likes watching TV plays (电视剧). One evening at 7:00, Sam watches an interesting soccer game on TV. The TV also has a good TV play. It is Nina's favorite. She wants to watch it very much, but Sam sits before (在……之前) the TV. He doesn't let Nina watch the TV play. Nina is not happy, so she goes to her mother's home at 7:30 in the evening. When she comes into her mother's home, her father watches that soccer game, too.     

     “Where is my mother, Dad?”asks Nina.

     “She goes to your grandma's home,”says her father.

     “Why?”

     “I want to watch the soccer game, but she likes to watch a TV play.”

下列函数在其定义域上，既是奇函数又是减函数的是（     ）

下列四个多边形：①等边三角形；②正方形；③正五边形；④正六边形．其中，既是轴对称图形又是中心对称图形的是（    ）

顺口溜，写出音节对应的汉字，反复练读。

蜻蜓蝴蝶和tiān niú____，tián____野树林和花丛，你动我静一幅画，引来无数xiǎo   ____观众。

读某国在甲、乙、丙、丁四个不同时期的人口增长模式示意图，完成问题。