牙周病最有效的预防措施有()A．正确刷牙、定期洁治，养成良好的口腔卫生习惯 B．盐水 发布时间：2017-02-09 15:13 │ 来源：www.tikuol.com 题型：单项选择题 问题： 牙周病最有效的预防措施有()A．正确刷牙、定期洁治，养成良好的口腔卫生习惯B．盐水漱口，使用药物牙膏C．改变偏侧咀嚼习惯D．定期调，去除创伤因素E．牙龈翻瓣手术
题型：单项选择题 is very clear to everyone that he's round and tall like a tree.A．This B．What C．That D．It 查看答案
题型：单项选择题 情景交际。从方框中选择恰当的句子完成对话。 A. It's the bedroom. B. What about your flat? C. I live in a house in Long Beach, California. D. How big is it? E. I live with my parents.Amy: Hi, Simon. I hear you come from America. Simon: 1______ It's very big. Amy: 2______. Simon: It has 12 rooms. Amy: Oh, it's bigger than my flat. Simon: 3______. Amy: It has a dinning room, a bathroom, two bedrooms and a living room. Simon: Who do you live with?Amy: 4______ Which is your favourite place?Simon: 5______ Amy: I hope I can visit your flat one day. 查看答案