题目

如图现象最能证明的是（ ） A . 海平面上升 B . 地球是个球体 C . 郑和下西洋 D . 观察视野扩大 答案：B— Have you ever heard of the reading pen?— Yes. It can read out what you are pointing at. The unusual pen will become a useful tool in language teaching and learning.A.ordinaryB.specialC.perfect