单项选择题
A．through great social revolution B．through automotive technological revolution C．through numerous mechanical inventions D．through radical political reforms
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
A．the causes for his successes B．some of his failures C．another part of his personality D．why he was left behind the modem competition