what a high speed he is runing at

what a high speed he is runing at with a high speed 还是at a high speed?China has developed -- such a high speed. can he ( )(take) a high-speed train(高速列车） to shanghai?按正确形式填空 He usually drive _____ a high speed,which may cause traffic accident.填介词 High-speed 速度快是at a high speed 还是at the high speed at high speed 还是at a high speed,教材上是前一种两者区别是什么? at high/fast speedat high speed or at fast speed,要不要加a high-speed Internet high speed data card China’s train sets world speed record A new high-speed train from Shanghai to Hangzhou speed不是不可数嘛,那么at a high speed 又怎么说呢、、、 after a month of training,he became( )to the work as a high-speed maglev train driver. a:addictedb:sensitive c:loyal d:equal After a month of training ,he became ( ) to the work as a high-speed maglev train driver .A、 addicted B、 sensitive C 、loyal D 、equal Could you tell me _____- Certanily.In half an hour.A.when will the high speed train arriveB.when the high speed train will arriveC.when would the high speed train arriveD.when the high speed train would arrive the industry in our country has developed at ____ since 1979a. rapid speed b.quick speed c.high speed d. fast speed _________ - He's a high school student.A.Where does he work?B.What does he look like?C.What does he do?D.Who is he? what high speed the coaster is moving at 后为什么加at