A．dramatic facts B．a firsthand story C．an emotional appeal D．sharply contrasting ideas
单项选择题The two letters are probably writing to（）_.
A．an advertisement company B．an administration office C．a school newspaper D．a travel agency
单项选择题What is the best title for this passage7（）
A．How to Heat Water B．Is It a Solid, Liquid or Gas. C．Density and Weight D．Cooking with Water
