聽寫填空,只寫填空內(nèi)容,不抄全文,5-10句,不用寫標(biāo)號(hào),注意標(biāo)點(diǎn),口語中因結(jié)巴等問題造成的重復(fù)單詞只寫一遍~

Hint:
magnetite

Today, a Swedish student asks scientist, "My name is Adam Bergner, I come from Linkoping in Sweden and my question is how are birds able to navigate?"

There are many theories, and a recent one came from Klaus Schulten, a biophysicist at the University of Illinois at Urbana-Champaign. [---1,2---]

Klaus Schulten: [---3---] (有一個(gè):)

[----4,5---] He thinks birds also utilize Earth's pervasive, global magnetic field - the one that guides our compasses.

Klaus Schulten: [---6---]

[---7---]

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【視聽版科學(xué)小組榮譽(yù)出品】
He said birds usually navigate by physical landmarks, like highways or coastlines. But, in extreme weather or as they fly over oceans, they use a sort of internal compass. Many of us think that there are two senses of two compass senses in birds and other animals: one, that likely relies on magnetite, and the other one that relies on the biochemical reaction that is connected with visual system. Magnetite, a mineral with magnetic properties, is found in some birds' beaks. Schulten believes it helps birds identify strong or weak magnetic fields on Earth's surface. And that is more the general map that they need to use when they are in completely unknown territory. Schulten believes that ability comes from a light-sensing protein, located in only one eye of the bird. The protein picks up signals, based on light, to send messages to the brain about the direction of the magnetic field.