急性白血病患者血小板输注指征是（）。

A.PLT<20×10⁹/L

B.PLT<50×10⁹/L

C.PLT<30×10⁹/L

D.PLT<40×10⁹/L

E.PLT<60×10⁹/L

— Is there a pay phone _______ the neighborhood?         

—Yes, it's ______ Center Street _______ the right.      [ ]

A. in, down, on      

B. on, on, in           

C. in, on, in        

D. on, down, on