伤寒恢复期（）。
A.伤寒第一次菌血症
B.伤寒第二次菌血症
C.伤寒肠道并发症
D.伤寒后再燃
E.伤寒后复发
参考答案：E
方程x2-2007|x|＝2008所有实数根的和等于( )。
A．2007
B．4
C．2
D．-2007
E．0
It rained heavily this morning, but ______ of my classmates were away from school. [ ]
A. neither
B. none
C. all
D. both
