闭合性损伤中最容易损伤的脏器是（）
A.肾
B.肝
C.脾
D.肠系膜
E.小肠
参考答案：C
— How long has he ______ ill?
— About a week. He ______ ill five days ago. [ ]
A. fallen; was
B. been; felt
C. been; fell
D. fallen ; fell
简述确定单位工程施工起点流向时，一般应考虑哪些因素？
