课程目录：
├──01.Great landmarks (1_A).mp4 104.46M
├──02.Great landmarks (1_B).mp4 72.42M
├──03.Great landmarks (2_A).mp4 73.32M
├──04.Great landmarks (2_B).mp4 56.13M
├──05.All Kinds of Jobs （1／A）.mp4 72.52M
├──06.Jobs people do （1／B）.mp4 55.18M
├──07.Jobs people do （2／A）.mp4 72.31M
├──08.Jobs people do （2／B）.mp4 56.25M
├──09.Animals of the Coast （1／A）.mp4 77.25M
├──10.Animals of the Coast （1／B）.mp4 65.80M
├──11.Animals of the Coast （2／A）.mp4 96.23M
├──12.Animals of the Coast （2／B）.mp4 73.24M
├──13.Getting to Work（1／A）.mp4 90.55M
├──14.Getting to Work （1／B）.mp4 63.91M
├──15.Getting to Work （2_A）.mp4 72.71M
├──16.Getting to Work （2／B）.mp4 52.85M
├──17.Our Earth (1_A).mp4 75.39M
├──18.Our Earth (1_B).mp4 69.29M
├──19.Our Earth (2_A).mp4 57.14M
└──20.Our Earth (2_B).mp4 74.16M
