【简答题】C The unknown world's mystery The sea is the biggest unknown part of our world. It covers sy-one percent of the earth. There is still much to be discovered about this vast blanket of water. If th...
【单选题】听力原文:The floor in the hallway is wet and slippery. (A) Just leave it in the hall. (B) Yes, I think a pipe broke. (C) Sure, let's meet there at 1. (12)