金黄色葡萄球菌感染病变内的主要细胞是
A．中性粒细胞B．嗜酸性粒细胞C．单核细胞D．淋巴细胞
参考答案：A
10. We went through a period _____ communications were very difficult in the rural areas.
A．which
B．whose
C．in which
D．with which
人体出生后，干细胞的数目（）。
A.越来越多
B.越来越少
C.基本恒定
D.30岁以前最多
E.40岁以后减少
