单项选择题
A．be sure his facts are accurate B．report the mews correctly C．write articles clearly D．all of the above
A．their sizes B．the usual pattern of their migrations C．their environments D．their habits
A．the influenza could be cured like other types of influenza B．the influenza must be treated in a special way C．the influenza did not have to be treated D．the influenza could not be cured by any known medicine