题目

下列可以说明地球的形状为球体的是：①登高望远；②远航的船舶逐渐“隐没”在地平线下；③麦哲伦船队环球航行；④流星现象。 A . ①②③ B . ②③④ C . ①③④ D . ①②④ 答案：A20、--- They suggest the number of cars should be limited to stop air pollution. ---          , the idea is not very practical.        A．Sounds good as it                                B．As it sounds good        C．As good it sounds                                D．Good as it sounds