职业病是指()

A．与职业有关的疾病

B．由职业因素引起的疾病

C．由职业性有害因素直接引起的疾病

D．在职业活动中由理化因素引起的疾病

E．由物理、化学、生物因素所引起的疾病

Mr. Black must be worried about something. You can ____ it from the look on his face.

A．reason

B．recognize

C．read

D．realize