Reading FunSub topics go hereReading FunSub topics go here名词性从句主语从句宾语从句表语从句同位语从句判断1. It is probable that some time in the tenth century black powder was firstpounded from its basic ingredients of

abandon vt.离弃放弃 abbreviation n.缩略语 abnormal a.反常的变态的 abolish vt.废除 aboriginal n.a.土著(的)土生动植物(的) abort v.取消流产 abortion n.流产(计划)失败 aboundvi.多富于 abrasion n.磨损擦伤处 abridge v.(书等)删节 abrupt ad