whiCh oF thE Following stAtEmEnts ABout iCE-nuClEAting-ACtivE BACtEriA is truE
A．thEy mAy Cool thE grAin to - 10℃.
B．thEy CAn wEAkEn thE BEEtlEs' rEsistAnCE to ColDnEss.
C．thEy CAn BE grown on most plAnt lEAvEs.
D．thEy ArE usED only in BiologiCAl rEsEArChEs.