A series of stimulus policies and supportive measures taken by the government _____ to promote change in the economic environment in this area.

A．are expecting

B．are expected

C．is expecting

D．is expected

患者，女性，25岁。左下腹隐痛伴脓血便2年，加重3个月，抗感染治疗无效，大便培养阴性，钡灌肠检查示"慢性结肠炎"。查体：腹平软，左下腹轻压痛，未扪及包块。

进一步最应警惕发生的并发症是（）。

A.急性心力衰竭

B.急性肠穿孔

C.急性呼吸功能衰竭

D.急性肠梗阻

E.急性消化道大出血