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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(xué)非常適合。我曾經(jīng)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(xué)習(xí)的同學(xué)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(guān)鍵詞，回復(fù)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(fù)填空答案格式如下：1____2____3____...et.al.
This room is ______ to electric fish. The eel in the tank behind me can produce a strong ______ of electricity to stun its prey, but most of the fish in here produce only weak electrical ______ that are useful for ________, locating food, and even for communicating.
The knife fish is a good example. This fish navigates using tiny ________in the skin that are sensitive to electrical impulses. The knife fish produces an electrical signal, and the receptors in its skin let it know when the signal it distorted by a tree root, or some other obstacle, so it can go around it.
Fish also use the ability to produce and detect electrical impulses to communicate. They can tell each other what species they belong to, how big they are, and whether they're male or female. We have a tank here that's specially equipped to convert the inaudible signals the fish produce into sounds you can hear when you put on these headphones. I urge you all to listen in when I'm done speaking.
Now have a look at the electric rays. Rays are especially interesting to medical researchers because of the organs they use to produce electricity. These organs contain a chemical that carries signals from one nerve ending to the next, not only in rays, but also in people. By studying these organs, scientists hope to learn more about diseases that interrupt the transmission of impulses from one nerve to another.
