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：assault“攻击，袭击”。detect“察觉，发觉”；contaminate“污染”；occupy“占据，占用”；attack“攻击”。根据题意，吸入的烟应该是会伤害人们的口腔和咽喉。故选D。