问答题
A．the color mechanism of the eye in use at the time of each viewing B．what kind of viewing had immediately preceded each of the viewings C．the properties of the surface being viewed D．whether the object was seen in artificial or natural light
A．stand over them while they worked and make unpleasant remarks B．go out for a drink and let them solve their own problems C．provoke them into disliking him D．use bitter humour to draw their attention to their mistakes