1. ( who are they? ) Who are they? They are drivers.（ what do they do? ）解释一下，后面的回答他们是司机，应该问的是职业，所以应该改为what do they do? 2.横线依次填Is, in, first floor, isn't.
楼上不懂装懂 who are they?难道不是问职业吗？笑
