Smoking makes one six times more likely to get oral cancer partly because the smoke constantly assaults the tissues that line the mouth and throat.

【正确答案】 D

【答案解析】解析：题干：吸烟使得患口腔癌的几率增高六倍，部分原因是吸入的烟会持续伤害口腔和咽喉表层的薄膜。assault攻击，袭击；attack攻击；detect察觉，发觉；contaminate污染；occupy占据，占用。根据题意，D为正确选项。