证券投资政策是投资者为实现投资目标应遵循的基本方针和基本准则。（）
参考答案：对
哪一项可诊断为闭经()
A.月经来潮后又中断3个月
B.月经来潮后又中断8个月
C.居经
D.年满l4周岁，月经尚未来潮
E.49岁，月经l年余未来潮
Professor Smith, along with his assistants, _____on the Project day and night to meet the deadline.
A．work
B．working
C．is working
D．are working
