题目

When I was twelve years old, my family were the first black people to move into an all-white part of Grand Rapids, Michigan. Many of our new   1   weren’t very welcoming. Some of the adults said   2   that we should return where we came from. The   3   sometimes threw stones at me or   4    me home from school. Most of my teachers   5   ignored me, but not Dorothy Bean, my history teacher. Miss Bean was angry at how badly I was being   6  , but she didn’t say this to me. Miss Bean showed her   7   for me by teaching me just like anyone else.   8   being unn某报告团在礼堂作报告，同时用播音器直接播出．试问在离报告人40m远处的听众和离礼堂400km远的收音机前的听众谁先听到报告？（已知v声=340m/s  v电波=3×108 m/s）