要确定诊断、首选的检查是

A．腹部B超

B．下消化道造影

C．钡剂灌肠

D．纤维结肠镜

E．腹部CT

It turned out to be a good harvest of wheat this year, ____ lack of rain. [ ]

A. regardless of

B. in spite

C. due to

D. in case