能量饲料是指干物质中粗纤维含量低于18%，粗蛋白质含量低于（）%的谷实类、糠麸类、草籽树实类、块根块茎和瓜类等。饲料工业上常用的油脂类、糖蜜类等也属于能量饲料。

My first roller coaster experience was not pleasant. It was in the summer of 2009, in Six Flags, Massachusetts, the US. I went    小题1:   with a group of friends. We were all very excited about roller coaster   小题2:   waited anxiously for the ride to begin. As the roller coaster got up higher and higher, however, my heart started to beat   小题3:   hard that I even could see my shirt move up and down. I could feel the wind getting stronger and brushing through my hair. Then the big drop came. I closed my eyes and told    小题4:   that it would be over in two seconds, but it felt like forever. I was pushed up from my seat as if I    小题5:  to be thrown out of the car.  小题6:   the time I finished the ride, I could barely stand up or speak. So when my friends asked me    小题7:  I thought of the ride, I just answered with silence. No matter how hard I tried, I could not make    小题8:  sound.