单项选择题
A. early B. behind C. ahead D. late
A．people cannot sent visible information until 19th century B．we cannot communicate without sound C．the ways of communication are similar in different countries D．in ancient time, enough people is necessary to send messages over distance
A．women should lay more emphasis on their own qualities B．beautiful clothes can make women more attractive C．women have to show their beauty through their looks D．women are more curious about new things than men