多始于童年或青少年且持续的自然病程（）
A.癔症
B.人格障碍
C.双相情感障碍
D.周期性精神病
E.心因性应激反应
参考答案：B
John received an invitation to dinner, and with his work ____, he gladly accepted it. [ ]
A. finished
B. finishing
C. having finished
D. was finished
维生素D缺乏性手足搐搦症发生惊厥是由于血清中（）
A.钾离子浓度降低
B.钠离子浓度降低
C.氯离子浓度降低
D.钙离子浓度降低
E.磷离子浓度降低
