在喜庆的日子里，人们有时要敲锣打鼓，当鼓正在发声时，我们把小纸屑放在鼓面上，发现小纸屑会不停地跳动，说明鼓在发声时鼓面是____的，鼓声是通过____（填介质名称）传到人们耳朵中的。
56×9____56
按教材填空
（1）有些蛋白质起____ 作用，能够调节机体的生命活动，如胰岛素．
（2）核酸是细胞内____ 的物质，在生物体的遗传、变异和蛋白质的生物合成中具有极其重要的作用．
（3）功能越复杂的细胞膜，____ 越多．
（4）____ 染液是将活细胞中线粒体染色的专一性染料，可以使活细胞中的线粒体呈现蓝绿色，细胞质接近无色．
（5）这些____ 等结构，共同构成细胞的生物膜系统．
（6）____ 称为原生质层．
decide against they run job profession hobby agree grow train
Many teenagers have ____. But sometimes these can get in the way of ____ schoolwork. Liu Yu is a ____ star on his school team. His dream is to be a ____ runner when he ____ up. His parents won't allow him ____ so much although they have nothing ____ running. They think their son needs to think about other possible____. Liu Yu ____ with them. He thinks his parents are too strict with him. He also thinks it's very important ____ for himself. Only in this way can he have a chance to achieve his dream.
