Mother wants __________ the house. Would you __________ her please? [ ]

A. clean, help

B. clean, to help

C. to clean, help

D. to clean, to help

貂病毒性肠炎的特征性病变是　　

A．肝质脆，胆汁充盈

B．大肠出血性炎症，肝肿大

C．脾脏肿大，暗紫色，肾脏肿大

D．大肠纤维素性炎症，淋巴结肿大

E．小肠急性、卡他性纤维素性或出血性炎症