伤寒复发时可出现()。
A.肥达反应效价迅速增高
B.血培养阳性
C.IgM等免疫球蛋白又都升高
D.临床症状比初次重
E.肠穿孔
参考答案:B, C
Gone ________ when we were oppressed.
A.are the days
B.the days are
C.the days have
D.the day is
结合实例,说明人际吸引的主要条件。