The race began on January 27. The first musher, Shannon, picked up the medicine from the train at Nenana and rode all night.

　　31

　　he handed the medicine to the next musher, Shannon`s face was black from the extreme cold.

　　On January 31， a musher named Seppala had to

　　32

　　a frozen body of water called Norton Sound .It was the most

　　33

　　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 34

　　,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 sonw blocked his 35 .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 36

　　the trail again. The only hope was Balto,Kaasen’s lead dog, Balto put his nose to the ground, 37

　　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

　　38

　　.He had foung the trail

　　At 5:30 am on February 2, Kaasen and his dog 39

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