Unit One Going on Board 1
Unit Two Inspecting the Ship 10
Unit Three Plant Quarantine 22
Unit Four Animal Quarantine 35
Unit Five At the Seaport 46
Unit Six At the Airport 61
Unit Seven Receiving a Foreign Delegation 75
Unit Eight Exchanging Information with the Australian Friends 87
Unit Nine Hosting the Guests 102
Unit Ten Going Abroad 115
Unit Elevn Making Arrangements 129
Unit Twelve Attending the Conference 141