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初三英語(yǔ)聽力練習(xí)資料歸納
初三英語(yǔ)聽力：鳥類并不笨頭笨腦
Neuroscientists' opinions about the brains of birdshave changed.
神經(jīng)系統(tǒng)科學(xué)家關(guān)于鳥類大腦的傳統(tǒng)觀念發(fā)生了轉(zhuǎn)變。
In humans and other mammals,the roof of theforebrain has evolved into the cerebral cortex, astructure responsible for flexiblelearning andreasoning.
人類和其他哺乳動(dòng)物的前腦頂層已經(jīng)進(jìn)化為大腦皮層，這一結(jié)構(gòu)主管彈性學(xué)習(xí)和推理能力。
Early neuroanatomists thought that the forebrainroof was small and simple in birds, with itsforebraininstead being dominated by structures in its base, called the basal ganglia.
早期的神經(jīng)系統(tǒng)科學(xué)家認(rèn)為鳥類的前腦頂層在大腦中面積小，構(gòu)造簡(jiǎn)單，且并非由大腦基底部名為基底神經(jīng)節(jié)的結(jié)構(gòu)組成。
Without anelaborate forebrain roof, it seemed that birds couldn't be very smart.
因此，鳥類并不擁有復(fù)雜精妙的前腦頂層，這似乎決定了鳥類智商有限。
Recent research shows that birds are a lot smarter than scientists once thought.
最近的研究表明鳥類要比科學(xué)家想象的聰明得多。
To give just afew examples, the New Caledonian crow can manufacture and use tools.
例如，新喀里多尼亞烏鴉會(huì)制作和使用工具。
The African grey parrotcan learn to classify objects into categories, and the Florida scrub jaystores food in dozens ofcaches and can remember their locations for future use.
非洲灰鸚鵡能學(xué)會(huì)對(duì)東西進(jìn)行分類，佛羅里達(dá)灌叢鴉會(huì)將食物存儲(chǔ)在不同的地方，并且能記住位置，以備將來之需。
It turns out that neuroanatomists had it all wrong about bird forebrains.
結(jié)果是神經(jīng)解剖學(xué)家對(duì)鳥類前腦的研究完全錯(cuò)誤。
During more than 300 million years of separate evolution, the forebrain roofs of birds and ofmammals each grew largerand more elaborate, but in different ways.
初三英語(yǔ)聽力：Airplanes-飛機(jī)
Airplanes are amazing. How does something so big and heavy get off the ground? I’m alwaysamazed at how the millions of different parts work together. Travelling by airplane is always a wonderful experience. I don’t care whether economy class is cramped and has no space. I like playing with the in-flight entertainment system, especially now they have all the latest movies. I also love airplane food. Many of my friends say it’s disgusting, but I love it. I often ask the passenger next to me if I can have the dessert or roll they don’t want. The only thing I don’t like about planes is turbulence. When the airplane hits those air pockets, I always worry we’ll crash. But I once read that turbulence has never caused an airplane to crash.
初三英語(yǔ)聽力：脂肪儲(chǔ)存的來龍去脈
When you eat a fatty food, it moves through thestomach andon to the intestines.
當(dāng)你食用富含高脂肪的食物時(shí)，脂肪通過胃流入腸道。
In the intestines, a number of processes occur totransfer fat from the foodto special fat cells in yourbody.
在腸道中，脂肪經(jīng)過一系列的消化流程從食物轉(zhuǎn)化為體內(nèi)的特殊脂肪細(xì)胞。
First, the gall bladder produces bile that breaks thefood's fat droplets into smaller droplets.
首先，膽囊分泌膽汁分解食物脂肪滴，使其更小。
Next,the pancreas secretes enzymes that attack the fat droplets and break them down into twoparts:fatty acids and glycerol.
然后，胰腺分泌胰腺酶作用于脂肪滴，將其分解為兩個(gè)部分：脂肪酸和甘油。
This happens because fat droplets are too big to pass through cell membranes.
這是因?yàn)橹镜芜^大，無法穿過細(xì)胞膜。
The broken downfat is absorbed by the cells lining the intestine, where it is reassembled intofat molecules andeventually shuttled into the bloodstream with the help of lipoproteinparticles.
分解的脂肪被腸粘膜細(xì)胞吸收，重組成脂肪細(xì)胞，最后負(fù)載在脂蛋白顆粒上進(jìn)入血液循環(huán)。
For the most part fat is stored in the fat cells that compose fatty tissue.
大部分的脂肪儲(chǔ)存在脂肪細(xì)胞內(nèi)，形成脂肪組織。
Think of a fat cell as a tinyplastic bag filled with a drop of fat.
脂肪細(xì)胞好比一個(gè)容納脂肪滴的塑料袋。
Interestingly, fat cells do not multiply.
有趣的是，脂肪細(xì)胞并不會(huì)變多。
The body contains a finitenumber of fat cells that expand as they absorb fat.
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