19. One was a St. Bernard dog named Barry, who worked in the Alps in the early 1800s, when St. Bernards were still used to rescue people caught in snowdrifts or avalanches (雪崩).
20. Then there was Chips,the first war dog to be shipped overseas during World War Ⅱ.
21. Yet another animal hero was a canary named Bibs, the pet of an elderly woman, Tess, who lived alone in Tennessee and whose niece lived nearby.
22. Bibs died after alerting the niece.
23. Among the numerous heroes of history are animals.
24. He saved more than forty lives.
25. One night Chips pulled away from his handler and attacked a German weapons position, seizing one man and forcing the surrender of four others.
26. One day the niece heard a tapping at her window and discovered Bibs,so the niece quickly went to her aunt’s house and found Tess had struck her head on something and fallen over.

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