what high speed the coaster is moving at 后为什么加at

what high speed the coaster is moving at 后为什么加at what a high speed he is runing at It is whirling winds moving voilently at very high speed .It 【初二】at high speed可以加the吗? look,()high speed the roller coaster()! at high/fast speed the train is moving at the speed of 120 miles per hour. 请问Moving at a high speed for a long time put Sergei a second The speed ___light travels is very high.A which B at which C 英语翻译The high speed of air travel is gained at a cost. is dangerous _a car at such a high speed. he is good at the high jump 为什么要加the