thE ExAmplE givEn in pArA. i shows thAt DrEAms oFtEn _______.
A．AssumE A symBoliC nAturE
B．hElp us to mAstEr physiCAl skill
C．rEprEsEnt somE DiFFiCultiEs wE hAvE in liFE
D．rEminD us oF whAt wE ForgEt in wAking liFE