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本聽力材料來自于老托partb，partc，是公認實施有效的聽寫材料，對于上手托福時間不長的同學非常適合。我曾經一次短時間備考聽力提高了7分也歸功老托。希望大家和我一樣一定要堅持下來噢。相信堅持學習的同學聽力上都會有很大的飛躍！
Nopain, no gain.我們的安排是這樣的，第一遍用聽力軟件精聽材料（建議做單句聽寫，聽寫的時候不要偷看我給的挖空題），然后按照我給的挖空題填關鍵詞，回復后即可看到聽力原文和文章精解，我將把難點和易錯點oneby one 分析給大家。
回復填空答案格式如下：1____2____3____...et.al.
If you liked the colorful animals we just saw, you're going to love these next animals. Frogs. You might not normally think of frogs as being colorful, but these frogs definitely are. They are the dart-poison frogs of Central and South America. Look at their striking colors --- often yellow with black ______ or deep blue with black ______.
Beyond being nice to look at, these markings have a _____.They warn predators that these frogs are ______.When threatened, these frogs secrete a _______through their skin that would easily kill whatever animal might try to eat them. Their bright colors communicate this, and so most animals tend not to hunt them.
Now, speaking of hunting, for centuries these frogs were sought after by hunters. As you might think, the hunters didn't want to eat the frogs, but rather, they captured them for their poison. They would add the poison to the tips of their hunting arrows --- of course, nowadays most hunters use guns.
These days dart-poison frogs are of less interest to hunters than to medical researchers. Researchers believe that they can make new heart medicine from the poison, because it acts as a stimulant on the body's nervous system. Researchers think they could use it to stimulate a weak heart.
There is, however, a problem with doing research on these frogs. Those that are caught in the wind will produce their poison until they die. However, those that are born in captivity, like the ones you see here, will not produce any poison at all.
