题目

听下面一段较长对话，回答以下小题。【1】What does the man want the girl to do?A.Wake up earlier. B.Eat breakfast earlier. C.Get ready for school earlier.【2】When did the speakers go out to eat dessert last night?A.At 8:00 p.m. B.At 9:00 p.m. C.At 10:00 p.m.【3】What is the man most concerned about?A.The girl’s health. B.The girl’s schoolwork. C.The girl’s cooking skills.18．ag氯酸钾和bg二氧化锰充分混合加热后，剩余固体质量为c g．下列分析正确的是（　　）A．反应后固体中钾元素的质量减小B．生成氯化钾的质量为c gC．生成氧气的质量为（a+b-c）gD．剩余固体中的二氧化锰的质量为b g