山东德州2014届高考英语一轮复习完形填空加强训练9

　　Global warming could make humans ___36___, warn scientists who __37___ to have found __38___ that it caused the world’s first horses to shrink nearly 50 million years ago.

　　In fact, a team from the universities of Florida and Nebraska says it has found a __39___ between the Earth __40___ up and the size of mammals -- horses, in this __41__, the last time the world heated up.

　　The scientists used fossils to __42___ the ___43___ of horses from their earliest appearance 56 million years ago. __44__ temperatures went up their size went __45__, and vice versa（反之亦然）; at one __46__ they were as small as a house cat, said Dr Jonathan Bloch, curator of the Florida Museum of Natural History, was quoted by the "Daily Mail" as saying.

　　The scientists say that the __47___ warming could have the same __48__ on mammals -- and __49__ even make humans smaller. "Horses started out small, about the size of a small dog __50__ a miniature schnauzer(迷你型雪纳瑞犬). What`s surprising is __51__ after they first appeared, they then became even smaller and then __52__ increased in size, and that exactly __53__ to the global warming event, followed by cooling.

　　"It had been known that mammals were small during that time and that it was warm, __54__we hadn’t understood that temperature specifically was __55__ the evolution of body size," Dr Bloch said in the "Science" journal.

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