【判断题】当列车发生挤岔时应立即往回倒车以恢复原状。
【单选题】-Can you tell me how many colours ______ in a rainbow? -Seven. [ ]
【单选题】— ________ there any American teachers in your school? —________ .
【单选题】—______ there any apples on the table? —No, ______ . [ ]
【单选题】___________ a table over there. [ ]
【单选题】配送中心有多项基本作业,下列哪项作业不是所有配送中心都有的作业