On January 31, a musher named Seppala had to     52     a frozen body of water called Norton Sound. It was the most     53     part of the journey. Norton Sound was covered with ice, which could sometimes break up without warning. If that happened, Seppala might fall into the icy water below. He would     54    , and so would the sick children of Nome. But Seppala made it across.

　　A huge snowstorm hit on February 1. Amusher named Kaasen had to brave this storm. At one point, huge piles of snow blocked his     55    . He had to leave the trail(雪橇痕迹) to get around them. Conditions were so bad that it was impossible for him to     6     the trail again. The only hope was Balto, Kaasen’s lead dog, Balto put his nose to the ground,     57     to find the smell of other dogs that had traveled on the trail. If Balto failed, it would mean disaster for Nome. The minutes passed by. Suddenly, Balto began to     58     . He had found the trail.

　　At 5:30 am on February 2, Kaasen and his dog     59     in Nome. Within minutes, Dr. Welch had the medicine. He quickly gave it to the sick children. All of them recovered.

　　Nome had been      60     .

　　41.A.examined

　　B.warned    

　　C.interviewed    

　　D.cured42.A.harmless

　　B.helpless    

　　C.fearless    

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