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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