Though many of the heavy smokers have realized the serious effect that smoking has ______ their health, they continue to smoke instead of ______.A.for; giving it upB.on; quittingC.to; abandoningD.on; leaving
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B解析考查固定搭配。the serious effect是先行词，that smoking has ______ their health是定语从句，把先行词代入定从，是 smoking has the serious effect____ health，构成have an effect on 结构，所以第一空用on;根据句意：他们继续吸烟而不是戒掉。Quit停止，终止。所以选B。