患者男，70岁。近2年出现消瘦，进行性吞咽困难，胸骨后疼痛症状，遂来院就诊。

进展期食管癌的患者，进行内镜下介入治疗的方法有（）。

A.内镜下黏膜切除术

B.内镜下单纯食管扩张术

C.内镜下癌肿套扎术

D.内镜下癌肿消融术

E.食管内支架放置术

—___________ are the socks?

—___________ two dollars.[ ]

A. How much; It's

B. How much; They're

C. How many; It's

D. How many; They're