单项选择题
A．running errands for staff reporters B．writing small news stories C．reporting campus and student news D．both A and B
A．This influenza can cause death if not treated immediately. B．The number of the influenza virus can grow very rapidly. C．The people who got the disease recovered soon. D．The London doctors did not take the virus seriously at first.
A．paving material B．cement C．concrete D．the coal by-product