慢性萎缩性胃炎与慢性浅表性胃炎的主要区别是（）
A．慢性炎细胞浸润
B．腺体减少
C．中性粒细胞浸润
D．肠上皮化生
E．嗜酸性粒细胞浸润
参考答案：B
The old couple looked happy living in the city, but they ______ had a hard time.[ ]
A. frequently
B. actually
C. gradually
D. exactly
霍乱传染源是
A．家畜B．病人C．蚊虫D．螺蛳E．鼠类
