单项选择题
A．driving short distances in hot weather B．having their car insured for ￡ 20 C．driving slowly at all times D．making sure their car is in good working order
A．he hates idle talk B．it always comes at an inopportune time C．it might carry some important message D．he doesn't want to be impolite to any one on the telephone
A．different people have different ideas about the telephone B．high income is the precondition for the use of telephone C．telephone is essential only to those people whose career depends on it D．working people need a telephone