why hAvE thEAmEriCAns DEvElopED spACE shuttlE ACCorDing to thE pAssAgE
whiCh oF thE Following stAtEmEnts is not truE oF thE pAssAgE
A、it DisCussEs FErtility CliniCs.
B．it DEFinEs stEm CElls.
C．it mEntions ArtiFiCiAl FErtilizAtion.
D．it iDEntiFiEs thE origins oF stEm CElls.