BD
When I first lived abroad, I had to do the housework for others____a week’s accommodation.
A.in exchange for
B.with regard to
C.by means of
D.in place of
引起细菌性食物中毒的最常见致病菌是()
A.沙门菌
B.葡萄球菌
C.变形杆菌
D.副溶血性弧菌
E.致病性大肠杆菌