14. Skimping on sleep may make it tougher for a smoker to ditch the habit by_attention and cognition, changing cravings, affecting mood or increasing the reward value of cigarettes.
(A) sparing
(B) despairing
(C) impairing
(D) repairing

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統計： A(8), B(3), C(10), D(45), E(0) #1884222