具有沿黏膜或黏膜下扩散特点的肿瘤多见于（）
A.声门上癌
B.声门癌
C.声门下癌
D.扁桃体癌
E.下咽癌
参考答案：E
Being able to afford ______ drink would be ______ comfort in those tough times.[ ]
A. the; the
B. a; a
C. a; /
D. /; a
润滑的作用可减少机械磨损，延长机械（）。
