单项选择题
A．has made letter writing an art B．has prevented wars by avoiding written communication C．has made world different from what it was D．has caused wars by magnifying and extending human conflicts
A．affectionate B．approving C．disapproving D．neutral
A．saves lives of people in remote places B．enables people to live alone if they want to C．spreads both love and ill will D．replaces much written communication