If parents leave their children on            own, do you think the home is tidy or untidy when they return? [ ]

A. they

B. them

C. theirs

D. their

当左侧锁骨上窝淋巴结肿大时，被称为Virchow淋巴结，它是什么的标志（）

A.鼻咽癌转移

B.胃癌、食管癌转移

C.肺癌转移

D.胸膜间皮瘤转移

E.甲状腺癌转移