flocculation and deflocculation

A．Latin and Greek.B．English and French.C．French and German.D．Latin, Greek, French, and

ALACRITY:A．doubt and uncertaintyB．hesitance and unwillingnessC．pessimism and cynicismD．car

ALACRITY:A．doubt and uncertaintyB．hesitance and unwillingnessC．pessimism and cynicismD．car

【B7】A．off and onB．back and forthC．up and downD．far and wide

flocculation agent and deflocculation agent

【C2】A．now and thenB．over and overC．up and downD．here and there