Ⅳ.阅读理解

　　A

　　(2017·常德高三调研)Ever wonder how this season’s celebrations affect the environment？Guest blogger Krista Fairles takes an amusing look at this very topic.

　　The holidays are a wonderful，cheerful time when most people wait for Santa to bring them presents.But I’m not like most people.I spend my time wondering just what the environmental impacts of Santa Claus and his reindeer are，and more importantly，how I can calculate those impacts.

　　Lately I’ve been particularly curious as to whether Santa’s old sled is a clean green flying machine，or if he should be replacing his 8 reindeers with an environmentally－friendly car.

　　I should mention that，surprisingly，I was unable to find statistics specific to Santa’s magical flying reindeer，so these calculations use numbers from various sources and may not represent actual pollution caused by Santa and his animals.In other words，don’t complain to the government about the damage Santa is causing the environment based on this article.

　　Santa’s yearly trip around the globe is 44,000 km long，twice the average of a North American driver.If we assume that the magic provides the altitude for this trip，then reindeer power only needs to push Santa’s sled forward.To complete the trip in 12 hours，I estimate they must travel at a speed of about 3,100 km/h.To travel at this speed，for this length of time，the reindeer need to eat an incredible 980 million calories each！！

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