果树“小叶病”是由于缺（）的缘故。

Bad weather prevented the work ____ in time. [ ]

A. completed

B. from completing

C. to be completed

D. being completed

脊髓造影选用（）

A.碘化油

B.碘番酸

C.碘苯酯

D.泛影葡胺

E.胆影葡胺

红细胞破坏过多引起的贫血是（）

A.巨幼细胞贫血

B.缺铁性贫血

C.再生障碍性贫血

D.溶血性贫血

E.失血性贫血

“文件夹选项”对话框中，有（）个选项卡。

A.1

B.2

C.3

D.4

（）is the motor carrier service between the different cities domestically.

A. point to point truck     

B. city to city truck 

C. Domestic intercity trucking  

D. Domestic transportation