On January 31,a musher named Seppala had to
47
a frozen body of water called Norton Sound .It was the most
48
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
49
,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 50
.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
51
the trail again. The only hope was Balto,Kaasen’s lead dog, Balto put his nose to the ground, 52
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
53
.He had found the trail.
At 5:30 am on February 2, Kaasen and his dog
54
in Nome. Within minutes,Dr.Welch had the medicine.He quickly gave it to the sick children.All of them recovered.
Nome had been
55
.
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