胃癌、食道癌发生淋巴结转移时常出现在（）
A.右锁骨上窝
B.左锁骨上窝
C.颈部
D.腋窝
E.滑车上
参考答案：B
When you meet your teacher at 8:30 a.m., you say "_______". [ ]
A. Good morning.
B. Good afternoon.
C. Good evening.
D. Good night.
南京地铁一号线的紧急逃生门中的紧急疏散坡道采用（）设计。
A.吊环
B.吊带
C.吊丝
D.吊索
