28.The comedy Tooth Fairy is based on the story all western children know: If a kid leaves a tooth under their pillow, they’ll receive a visit from the tooth fairy, who takes the tooth and leaves a gift ________.

A．in general

B．in exchange

C．in total

D．in common

脏腑中有“主津”作用的是（）。

A.脾

B.胃

C.大肠

D.小肠

E.三焦