（）收纳直肠上部的淋巴。
A.骶淋巴结
B.髂内淋巴结
C.腰淋巴结
D.腹股沟浅淋巴结
E.肠系膜下淋巴结
参考答案：E
—Has William finished writing his graduation paper yet?
—I don’t know exactly，but he __________all day.
A．is writing
B．has been writing
C．was writing
D．wrote
要素禀赋理论的作者是亚当斯密。( )
