He was unaware of the financial crisis involed, so his choice was quite_____.

A．rational

B．arbitrary

C．mechanical

D．predictable

肺部的淋巴转移肿瘤最常见来自（）

A.甲状腺癌

B.胃癌

C.成骨肉瘤

D.肝癌

E.前列腺癌