单项选择题
A．served B．serves C．like D．likes
A．it is one thousand times more precise than microwave radar B．it provides precise measures of the velocity of space vehicles C．it is a new system of radar D．it can measure the movement of a spaceship less accurately than a microwave radar
A．most people on the sidewalk were on the same side as himself B．no one suddenly turned into a doorway C．a man was looking into the windows of a store D．no one wiped his face with a handkerchief