Question

【题目】 there are lost and found offices airports and stations．
这就是机场和火车站都有失物招领办公室的原因。

Answer 1

【答案】That's；why；at
【解析】考查固定句型“这就是……的原因”That's why，“机场”表示小地点，用介词 at。故填 That's why at。