工程造价计价特征有（）
A、单件性
B、批量性
C、多次性
D、一次性
E、组合性
参考答案：A, B, E
传染源向周围散播病原体所能波及的范围称（）
A.感染点
B.传染地
C.污染区
D.疫源地
E.传染区
The garden _______ while they were away from here. [ ]
A. took good care of
B. was taken good care
C. was taken good care of
D. was taking good care
