--What is the model plane like?

--Well, the wings of the plane are___________ of its body.

A．more than the length twice

B．twice more than the length

C．more than twice the length

D．more twice than the length

具有“泌别清浊”功能的脏腑是( )

A．膀胱

B．大肠

C．小肠

D．脾

E．肾