题目

从某高处由静止下落到地面的物体，在中间1s内通过的路程为30m，若空气阻力不计，则该物体下落时的高度为                                                                                                   m．                                                                                                                                �--- Is this raincoat yours?　 ---- No, mine ____ there behind the door. 　 A. is hanging　　 　　　 B. has hung　　 　　 C. hangs　　　 　 D. hung