题目

长江和黄河都流经的省区是（    ）                                 A、青海、甘肃               B、青海、四川     C、青海、西藏               D、四川、甘肃 答案：B----I`m really tired because I studied until midnight last night.------_________A. No problem.B. Why don`t you go to bed earlier tonight?C. You`re welcome.D. You can study for a test by taking notes.