Currently，many American women are still faced with the _____ of choosing between work and family commitments.

A．desperation

B．confusion

C．dilemma

D．concern

下列除去杂质的方法正确的是                                        

A．除去CO₂中的少量CO：通入O₂，点燃

B．除去Na₂CO₃稀溶液中的少量NaHCO₃：加热

C．除去FeCl₂溶液中的少量FeCl₃：加入足量铁屑，充分反应后，过滤

D．除去KCl溶液中的少量MgCl₂：加入适量NaOH溶液，过滤