riders, people on a roller coaster, loop, when the roller coaster moves in a circle, steel, a material used in modem roller coasters, tracks, the lines that trains and roller coasters move on, drop, when the roller coaster goes down suddenly, harnesses, a belt or bar to keep you in your seat on a roller coaster.

Exercise 1

由
打印
嵌入

排行榜

视觉风格

选项

切换模板

恢复自动保存：？