单项选择题
A．care for children. B．express herself. C．travel alone. D．use her physical strengt
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．Aluminum, silicon, and magnetic. B．Paving material. C．Fly ash. D．Concrete additiv