观察晚期食管癌在食管腔内生长情况（）。
A.CT扫描
B.食道钡餐造影
C.MRI检查
D.B超检查
E.内腔镜超声
参考答案：B
Was it on a lonely island _____ he was saved one month after the boat went down?[ ]
A. where
B. that
C. which
D. what
单元组合仪表各单元之间用统一的标准信号来联系的。
