in pArAgrAph 3, sEntEnCE 2, thE Author CompArEs wAtEr to molAssEs in orDEr to introDuCE whiCh oF thE Following topiCs
A．thE BACtEriAl ContEnt oF DiFFErEnt liquiDs.
B．whAt hAppEns whEn BACtEriA ArE ADDED to molAssEs.
C．thE molECulAr struCturEs oF DiFFErEnt ChEmiCAls.
D．how DiFFiCult it is For BACtEriA to movE through wAtEr.