— What's in the reading room? 

— There            a teacher, twenty desks and thirty chairs in it. [ ]

A. am

B. is

C. are

D. be

About the spleen, the right description is （）.

A．it is situated in the left lower part of thoracic cavity

B．its long axis is in the line of the 10th rib

C．it is palpable below the left costal arch

D．there are splenic notches on its anterior extremity

E．the hilum of spleen lies on the diaphragmatic surface