in thE pAssAgE, whAt DoEs it mEAn By "Chunks"
A．A thiCk piECE in irrEgulAr shApE.
B．A lArgE piECE oF rEADing mAtEriAl.
C．pArt oF thE rEADing tExt whErE thE unknown worD Exists.
D．thE wholE tExt.