精选优质文档-倾情为你奉上13. M3U1. ReadingFogFog warningWhen Polly left home that morning, the city was already covered in a grey mist. At lunch, the radio forecast that the mist would become a thick fog in the afternoon. At four oclock, Polly left work and stepped out into the fog. She wondered if the buses would still be running.No buses to King Street Once out in the street, she walked quickly towards her usual bus stop.How far are you going? the bus conductor asked her before he took