第27题: [单项选择]Questions 19 to 22 are based on the conversation you have just heard.A. She has finished her work. B. She is too exhausted to work. C. Her kids will arrive home after school. D. The man does not ask her to go back to the office. 参考答案:C 答案解析:[解析] 19-22 W: What a day! I’m exhausted. M: Well, it’s not over yet. W: Yeah, but it’s over
第32题: [单项选择]关于牙膏摩擦剂的描述中不正确的说法是()。 A. 摩擦剂是洁牙剂中含量最多的成分(为20%~60%) B. 用以加强洁牙剂的摩擦作用、去污及磨光牙面 C. 摩擦剂要有一定摩擦作用,但又不损伤牙组织 D. 常用的摩擦剂有碳酸钙、磷酸氢钙、氢氧化铝等 E. 摩擦剂内含酸性物质,有利于去污和磨光 参考答案:E 答案解析:此题考核的是牙膏摩擦剂的作用和性质。牙膏摩擦剂的作用、性质和种类包括了A、B、C和D项而没有E项。牙膏不可能利用酸性物质来增加摩擦剂的作用而使牙齿受到损害。