The presentof the United States is Barack Obama, who was a, a college professor and a successful writer.

问答题The speech “Ia” made by Martin Luther King Jr., has been considered one of the masterpieces in the history of speech.

单项选择题A．main B．few C． poor D．abundant

单项选择题A． numbers B．opinions C．aspects D．directions

单项选择题A． explore B．clean C．measure D．cover

单项选择题The best title for the passage is.