Most female workers in Beijing suffer from ________ connected to the global financial crisis,

according to a recent survey. [ ]

A．curiosity  

B．eagerness

C．thirst  

D．anxiety

磨机新配球后发现磨尾排出较多的豆石是因为（）

A、研磨体产生包球

B、钢球球径过大

C、钢球球径过小