单项选择题
A．She was a teacher. B．She was a visiting farmer. C．She was a journalist writing articles about China. D．She was a business woman helping her father with his business.
A．they have to watch out for possible attacks B．their brain hemispheres take turns to rest C．the two halves of their brain are differently structured D．they have to constantly keep an eye on their companions
A．risen B．to rise C．raised D．been raising