发动机是汽车的核心部件，发动机的质量决定了整车的性能和品质，现代汽车主要分汽油与柴油两类发动机，其中汽油发动机提供动力的是内燃机的汽缸．

若某台以汽油为燃料的汽车，发动机内有四个汽缸，其相关数据如表所示．

碳元素与氧元素的本质区别是

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.”