银川市位于（38°N，106°E），会发生以下哪种现象[ ]
A．四季更替
B．阳光直射
C．极昼
D．极夜
答案：A
(2013·陕西高考)Although Rosemary had suffered from a serious illness for years, she lost ________ of her enthusiasm for life.
A．some
B．neither
C．none
D．all
珍贵文物分为( )级。
A．一 B．二 C．三 D．四
