节目(29)
切换顺序- P30 visit the market41337:39
- P29 our resources13739:11
- P28 city town and surburb13839:42
- P27 from factory to you11837:36
- P26 jobs11329:59
- P25 the symbols of the us10042:33
- P24 the beginning of the USA8629:50
- P23 people start to coming to American9730:06
- P22 changes in the transportation11539:29
- P21 measuring the weather12433:33
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