I advise you to give up smoking for it is _____to your health.
A．harmB．harmlessC．harmfulD．harmfully
C
考查短語(yǔ)：be harmful to 對(duì)什么有害，句意：我建議你戒煙因?yàn)槲鼰煂?duì)你的健康有害。所以選C。
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