What is the talk mainly about？A．How artists gained fame.B．A schedule of art exhibits.C．One

What is the news item mainly talking about？A．Negotiations between developing and industria

What is the passage mainly talking about？A．The popularity of video－on－demand.B．The competi

What does the passage mainly talk about？A．NASA is cooperating with private companies.B．The

What is the passage mainly talking about？A．American children.B．American mother.C．American

What is the speaker mainly talking about？A．The problem of global warming.B．The difficulty

What is the talk mainly about？A．Overland transportation in the nineteenth century.B．Histor