Animals are built of many different materials—skin, fat, and more—and light moves through each at a different speed.Every time light moves into a material with a new speed, it bends and scatters.Transparent animals use different tricks to fight scattering.Some animals are simply very small or extremely flat.Without much tissue to scatter light, it is easier to be see­through.Others build a large, clear mass of non­living jelly­like(果冻状的)material and spread themselves over it.

　　Larger transparent animals have the biggest challenge, because they have to make all the different tissues in their bodies slow down light exactly as much as water does.They need to look uniform.But how they're doing it is still unknown.One thing is clear：for these larger animals, staying transparent is an active process.When they die, they turn a non­transparent milky white.

　　文章大意：你见过透明生物吗？本文介绍了透明的海洋生物。作者为我们介绍了物体之所以不能透明的原理，从而让我们理解没有什么器官组织的透明生物能够保持透明的奇特性。

　　1．According to Paragraph 1, transparent animals________.

　　A．stay in groups B．can be easily damaged

　　C．appear only in deep ocean D．are beautiful creatures

　　答案：B　细节理解题。根据文章第一段第三句Most of them are extremely delicate and can be damaged by a simple touch.可知，透明生物非常脆弱，轻轻的触碰都可能使其致命，故选B项。

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