钩体病在病程缓解第3~4日后可能出现再次发热-后发热是因为()
A.复燃
B.复发
C.先后二批病原体侵入
D.青霉素治疗后反应
E.迟发型变态反应
参考答案:E
It is an American custom when _____ friends to telephone ahead of time to tell them you are coming. [ ]
A. visit
B. visiting
C. to visit
D. visited
绿荫树类(庭荫树类)