托福阅读高分的关键是在于多看多练，同学们在日常练习中应该重视托福阅读材料的分析。为了帮助广大考生更好的复习，小编为大家整理了今天的托福阅读材料：Bat Spit，供大家复习参考。
在很多人的印象中，吸血蝙蝠是一种神秘的、可怕的生物。事实上这些小动物不仅不杀人，反而还有可能挽救很多人的生命。
Anyone who reads gothic fiction will tell you that vampires are bad news. People who read modern medical journals, however, might disagree–in fact, they think vampires just might help save lives.
The kind of vampire I’m talking about is Desmodus rotundus, commonly known as the “vampire bat.” Yep, these little creatures are real; and even though they almost never turn into suave Romanian counts to drool over, they do drool a lot themselves. That’s because their saliva is an essential part of their dining habits.
When a vampire bat latches onto, say, a steer, it needs to keep the blood flowing from the puncture made by its teeth. That’s achieved by a natural anti-coagulant in the vampire bat’s saliva. Despite what you see in the movies, vampire bats almost never drink human blood. But people do suffer from other blood problems–a leading one being stroke.
Stroke is caused by a clotting in the blood which stops the flow and can starve areas of the brain of oxygen. Doctors have generally broken up clots with a compound called tPA. TPA works okay, but it has dangerous side effects, and can even hurt brain cells.
A better idea? Bring in the bats, says researcher Robert Medcalf, a biochemist from Australia. Vampire bat spit contains a different compound, DSPA, which does the good things tPA does with far fewer side-effects. DSPA is now being tried on patients who have suffered a stroke; the data should be in within a year. If it works, doctors might have found an unlikely friend–the vampire bat.
以上就是今天前程百利为大家整理的阅读材料，大家在备考托福时可以积累其中的高分词汇及句型，并且练习提升阅读速度，迅速找到托福阅读的主题句和出题点。若您想了解托福考试更多相关信息请关注前程百利。
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