—Excuse me. Could you tell me _______? I want to post a letter.—Sure. It’s between Hongqi Supermarket and Jinglong Hotel.A. where was the post office B. where the post office is C. how can I get to the post office D. where the post office was 答案:B2017年1月18日,我国发射的世界首颗量子卫星“墨子号”正式交付用户单位使用,“墨子号”与地面控制系统交流靠的是( )A. 次声波 B. X射线 C. 红外线 D. 电磁波