题目

地球上产生昼夜交替的主要原因是（ ） A . 地球是个球体 B . 地球不停地自转 C . 地球在自转的同时绕太阳公转 D . 地球总是斜着身子绕太阳公转 答案：B-- The secretary is already on the way to the company, she?-- She was badly hurt in the accident and sent to the hospital.A.hasn't; YesB.hasn't; NoC.isn't; YesD.isn't; No