设全集U＝R，集合M＝{x|x>0}，N＝{x|x²≥x}，则下列关系中正确的是(　　)

A．M∪N⊆M

B．M∪N＝R

C．M∩N∈M

D．(∁_UM)∩N＝∅

________ you are supposed to do ________ you don't like a thing is change it. Don't complain.

A．That; why

B．What; when

C．What; where

D．That; how