制约西北地区农业生产的主要因素是[ ]
A、科技条件
B、地形条件
C、光照条件
D、水源条件
答案：D
通知的种类有( )。
A．指示性通知
B．批示性通知
C．周知性通知
D．会议通知
—What ____ does she like?
—Baseball. She ____ every day. [ ]
A. exercise; exercise
B. exercise; exercises
C. exercises; exercise
D.exercises; exercises
