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．The telephone has helped to save people from illness and fire. B．The telephone has helped to prevent wars and conflicts. C．The telephone has made the modern city neither better nor worse. D．The telephone has had positive as well as negative effects on us.