下图描述的是我国古代的君臣关系。君臣关系从坐而站而跪，说明中国古代中央政治制度演变的重要特点是

A．皇权的不断加强

B．内阁制度日渐成熟

C．等级制度越来越严格

D．中央对官员的管理日益加强

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.