题目

如图，枯井中的青蛙位于井底O点“坐井观天”，下图中青蛙通过井口观察范围正确的是（ ） A . B . C . D . 答案：B—How many students went to plant trees last year？—It's hard to say. ______ people, I think.A.Hundreds ofB.Hundred ofC.Two hundreds