thE mAin iDEA oF thE thirD pArAgrAph is thAt________.
A．A mAturE torpEDo is CApABlE oF proDuCing Enough ElECtriCity to knoCk Down A mAn
B．thE mAss oF thE Fish DECiDEs thE intEnsity oF ElECtriC powEr it gEnErAtEs
C．thE strEngth oF shoCk givEn By A young ElECtriC rAy CAn only light thE BulB oF A poCkEt FlAshlight
D．to mAkE Full usE oF thE EnErgy proDuCED By ElECtriC Fish, suitABlE wirEs shoulD BE AvAilABlE