It was a cold January in 1925 in North Alaska. The town was cut off from the rest of the world due to heavy snow. On the 20th

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问题    It was a cold January in 1925 in North Alaska. The town was cut off from the rest of the world due to heavy snow.
   On the 20th of that month, Dr. Welch【C1】______a Sick boy, Billy, and knew he had diphtheria, a deadly infectious (传染的) disease mainly affecting children. The children of Nome would be【C2】______if it struck the town. Dr. Welch needed medicine as soon as possible to stop other kids from getting sick.【C3】______, the closest supply was over 1, 000 miles away, in Anchorage.
   How could the medicine get to Nome? The town’s【C4】______was already full of ice, so it couldn’ t come by ship. Cars and horses couldn’ t travel on the【C5】______roads. Jet airplanes and big trucks didn’ t exist yet. 【C6】______
   January 26, Billy and three other children had died. Twemty more were【C7】______Nome’ s town officials came up with a(n)【C8】______They would have the medicine sent by【C9】______from Anchorage to Nenana. From there, dogeled(狗拉雪橇)drivers -known as "mushers" -would【C10】______it to Nome in a relay(接力).
   The race began on January 27. The first musher, Shannon, picked up the medicine from the train at Nenana and rode all night. 【C11】______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【C12】______a frozen body of water called Norton Sound . It was the most【C13】______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【C14】______, 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【C15】______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【C16】______the trail again. The only hope was Balto, Kaasen’ s lead dog, Balto put his nose to the ground, 【C17】______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【C18】______He had found the trail.
   At 5:30 am on February 2, Kaasen and his dog【C19】______in Nome. Within minutes, Dr. Welch had the medicine. He quickly gave it to the sick children. All of them recoverd.
   Nome had been【C20】______.
【C17】

选项 A、pretending
B、trying
C、asking
D、learning

答案B

解析 A.pretending假装;B.trying努力;C.asking问,要求;D.learning学会。Kaasen的雪橇狗努力嗅着其它狗的味道,故选B。
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