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Then,a Siberian husky(a kind of dog)named Balto saved the day.Balto was just one of 150sled()dogs used to deliver medicine to the town through whiteout snow and dangerous ice.And although Balto had never stood out from the rest of the pack()before,he proved to besurprisingly skillful and tough in the last leg of the journey.Now known as the Nome Serum()Run of 1925,the race began on January 27,1925,when 300,000 doses of antitoxin (arrived in Nenana by train from Anchorage.Themedicine was placed inside a metallic container,and then taken out into the Alaskan wilds by thefirst sled driver,"Wild Bill"Shannon,who arrived at the first handoff site with injuries caused bythe extreme coldness and two of his dogs lost.Eventually,the medicine made its way to LeonhardSeppala,who set out confidently with his 12-year-old sled dog,Togo,leading the pack.Togo led Seppala's pack until they reached the next sled driver,Charlie Olson,who thenpassed it down to Gunnar Kaasen.But Togo no longer led the pack.Instead,Kaasen completed thelast leg of the journey with Balto as his frontrunner.Although Kaasen couldn't even see in thewhiteout conditions,and temperatures dropped to around -40 degrees Fahrenheit,Balto pressedon,successfully leading the pack to Nome,with the serum,on February 2.Finally able to rest for the first time since the journey began,Kaasen looked to Balto and said,"What a fine dog!"And with that,Balto became a national hero who remains beloved nearly acentury later.24.What's the function of paragraph 1?A.To provide background information.B.To inspire the readers'imagination.C.To introduce a terrible disease.D.To support an argument.25.What can be learned about the Nome Serum Run of 1925?A.Its exact starting point was in Nome.B.It suffered the loss of a sled driver.C.Its aim was to save the 19 sick people.D.It was completed through teamwork.26.What did Togo do during the journey?A.He saved the serum from being broken.B.He protected other dogs on the way.C.He served as the guide of Kaasen.D.He led the group for some time.27.What may be a suitable title for the text?A.The Qualities of a Great Sled DogB.The Origins of the Alaskan HuskyC.Balto-The Hero of the Nome Serum RunD.Nome-The Town That Survived an EpidemicCFor more than 15 years,I've traveled to different parts of the world,where I take out rottenmeat and wait for flies to appear.My research is related to understanding how an environmentinfluences a fly's ability to search for and find its food source,its single purpose of living.Forexample,flies rely on wind to carry scents across varying environments.Warmer temperatures promote fly activity because they're poikilothermic-meaning cold-blooded-一and need heat to warm up their muscles for flight.Flies use visual cues(视觉信号)tofly through the air and to avoid barriers,so they're more active during the daytime.Blow flies can travel up to 28 miles for food.Most of the time when I set a piece of bad-smelling rotten meat,a large group of flies will come right away.But other times I'm surprisedwhen no flies come to enjoy the big meal I've prepared.When a female fly smells something that might be a good food source for her babies,she landson it and assesses whether there's enough to support her 400 or so eggs,which means life anddeath for her babies.A mom fly's ability to smell out a good "home"for her babies is the key tothe survival of the species and ultimately why this sense is so strong.英语试题第4页（共8页）