Nowadays it is difficult for people to find ______ work in the world because _________ economic situation is very serious.

A．/; an

B．/; the

C．the; the

D．a ; /

工作丰富化的管理措施是根据（）提出来的。

A.双因素理论

B.期望理论

C.公平理论

D.需要层次论