问题: Whatcanweinferfromthispassage?
A: lldeadlydiseasesarenowkeptundercontrolofdoctors.
B:Mostpeopletodaycanliveaslongas80or90years.
C:eathcontrolwasnotassuccessfulinthe1920’sasitistoday.
D:irthControlalsocontributestoworldpopulationincrease,butjusttoasmallerextent.
