They spent the afternoon _________ in the street, not knowing what to do.

A．putting on

B．blocking out

C．holding out

D．fooling around

双下肢中枢性瘫痪（）。

A.脊髓颈膨大病变

B.高颈段脊髓病变

C.胸段脊髓病变

D.脊髓腰膨大病变

E.骶段脊髓病变